A Glossary of Terms and Links


A Glossary of Term and Links to Useful Software

Because I have a Garmin, much of this FAQ relates to Garmin. However, if you use a TomTom or Magellan device and would like to see terms and links specific to those devices added, I will be delighted to do so.

3D = 3D buildings
ASR = Garmin speech recognition files
DEM = Digital Elevation Model
(for more information see http://www.poi-factory.com/node/44416)
ETA = Estimated Time of Arrival
GE = Garmin Express
HT = Historical Traffic
JCV = Junction View (used as folder and as an extension
JV(G) = Junction View (Garmin)
JV(N) = Junction View (NavTeq)
LG = Lane Guidance
MSS = Mass Storage System
MTP - Media Transfer Protocol
NT = New Technology (thanks to alandb)
P = Phonetics (text-to-speech)
PA = Phonetics + Voice Activation
SID = file type associated with traffic trends
TTS = Text To Speech (new versions have extensions tts3)
UMS = Universal Mass Storage
UTC = Universal Time Coordinated

(thanks to DorkusNimrod for most abbreviations)


A measure of how close an estimate of a GPS position is to the true location.
Active Lane Guidance
When on a route that contains an area compatible with Active Lane Guidance, the device will switch to split-screen view.

On the left will appear the standard map, indicating your route as usual. The right half of the screen will display a moving lane animation with a purple line that will indicate the way the driver should navigate.

Active Lane Guidance helps you stay on top of your route so you can ensure you're in the correct lane with plenty of time to spare, avoiding potentially dangerous last-minute maneuvers.

Addressing - logical
Logical addressing assigns a general area to each address. For example, if a stretch of road is known to contain house numbers from 100-199, the placement of addresses along that road is interpolated.
(thanks to Charlesd45 for finding this)
Addressing - point
addresses are given a precise location, which gives you much greater arrival accuracy.
(thanks to Charlesd45 for finding this)
A sound that plays whenever you approach a Custom POI or exceed a certain speed. The POI Loader will allow you to set proximity or speed alerts. When you select the Manual option in POI Loader for loading your custom POIs you will have the option to either assign a speed such as 35 MPH (or KPH depending on your preference) or a distance value such as 500ft (or meters). When you approach the point going 5 MPH less than the assigned value you will get one alert tone but if you are going that speed or greater you will get continuous alert tones. With the distance proximity it will only alert when you have reached that distance as you approach the POI

You can receive a "custom" alert if you have a sound file (.mp3/.wav) whose name is identical to the name of the custom POI file to the left of the extension. Since most new devices do not have a mp3 player, the sound file must be a .wav.

If you wish to test this capability, a test wav file is provided at

You can create your own .wav file by following the instructions at
Create Your Own Sound File

GPS signals include ranging signals, used to measure the distance to the satellite, and navigation messages. The navigation messages include ephemeris data, used to calculate the position of each satellite in orbit, and information about the time and status of the entire satellite constellation, called the almanac.

Almanac information is considered valid for up to 180 days.

Elevation especially above sea level or above the earth's surface
Avoidances, custom
Custom avoidances allow you to avoid specific roads and/or areas.

NOTE: Avoidances may need to be reset after each map update.

The horizontal direction from one point on the earth to another, measured clockwise in degrees (0-360) from a north or south reference line. An azimuth is also called a bearing.
Software by Garmin. See http://www8.garmin.com/support/download_details.jsp?id=4435

Basecamp will use the maps on Garmin units when that unit is attached to the computer

see also

There is a good Wiki at
on Data Management for Basecamp

Garmin mapping units come with permanently built-in basemaps, which typically include coverage of oceans, rivers, and lakes; principal cities, smaller cities, and towns; interstates, highways, and local thoroughfares; and railroads, airports, and political boundaries. Basemaps are available in a variety of global coverage areas, depending on the user’s needs.
Bird's Eye Junction View
Certain new Garmin devices will show an overhead view of major intersections before the normal junction view pops up. Bird’s Eye junction view offers a detailed view of interchanges, looking down as if from overhead.
Bluetooth is a wireless technology standard for exchanging data over short distances using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz between fixed and mobile devices.
An abbreviation for Bitmap.
A bitmap is an image file format used to store digital images. The term bitmap comes from the computer programming terminology, meaning just a map of bits. The GPS uses .bmp files for the Icons which show on the GPS device. According to Gary Hayman's site:
Must be of the Windows .bmp file type
Prefix of file name MUST match the .csv or .gpx file name
Size should be no bigger than 24 x 24 pixels [can be smaller but it will be hard to see]
MUST use 256 RGB color palette with standard web safe colors
The color 'magenta' (RGB R:255, G:0, B:255 [#ff00ff ] is treated as a transparent color)

If you are having trouble getting BMP icons to display, see some solution ideas at http://www.poi-factory.com/garmin/problemsolver

A collection of POIs sharing a common attribute. Categories for Custom POIs are determined by sub-folders (one level only) beneath the folder on which POI Loader is working. A good FAQ on Categories is at http://www.poi-factory.com/node/25721
City Navigator

(thanks to craigw for this link)

Cloning a Map
See the FAQ at
The specific set of satellites used in calculating a position; the satellites visible to a GPS receiver at one time
A set of numbers that describes your location on or above the earth. Coordinates are typically based on latitude/longitude lines of reference or a global/regional grid projection (e.g., UTM, MGRS, Maidenhead). Garmin Gal suggests http://www.itouchmap.com/latlong.html as the easiest way to get them
To reduce the size of an image by removing undesirable or unnecessary elements
(see Note 1 at bottom of FAQ)
An abbreviation for Comma Separated Values
A CSV file stores tabular data (numbers and text) in plain-text form. Plain text means that the file is a sequence of characters, with no data that has to be interpreted instead, as binary numbers. A CSV file consists of any number of records, separated by line breaks of some kind; each record consists of fields, separated by some other character or string, most commonly a literal comma or tab. Usually, all records have an identical sequence of fields.

POI Loader assumes a .csv file utilizes the following format for each POI (brackets [ ] denote optional text):

,,["][@]["],["] [comment]["]

Longitude and latitude must appear in WGS84 decimal degrees format (ddd.ddddd; negative numbers indicate West and South).

The file in which Favorites are stored on a Garmin device. Usually found in [device]:GarminGPX folder
Note: current.gpx is usually an output only file. The exception to this rule is when the date/time of the file is later than the date/time on which the device was last cold started (some devices "sleep"). Thus you can make changes (say, adjusting coordinates) to current.gpx using EPE and the change will be recognized - but the name will have a numerical suffix added. See also http://www.poi-factory.com/node/30708/#comment-291948
In the Garmin context, refers to POIs that a user loads using POI Loader
Cyclops Safety Cameras
Garmin offers on some models its own camera database. Most people say it is not a complete as that from poi-factory. Note that, starting with the 2013 line of devices, the Cyclops Safety Camera file is not available.
Demo Mode
Demo Mode is listed in a few manuals as being synonymous with Simulation mode.

Some Garmin automotive devices have a Demo Mode. When the demo mode is enabled, the device may display a demonstration video. Additionally, you may be able to use the regular navigation menus but the device will never go out of simulation mode.

If you've purchased one of the below devices and it is in demo mode, you may disable this mode by simply driving around with the device. To disable demo mode, you must be traveling at least 10 miles per hour for at least 30 seconds
From the main page, select Volume; press and hold the upper right corner of the Master Volume page until the Diagnostics Page is displayed; scroll down to the Demo Mode menu item and press it; press Disable Demo Mode; go back to main page.

The length (in feet, meters, miles, etc.) between two waypoints or from your current position to a destination waypoint. This length can be measured in straight-line (rhumb line) or great-circle (over the earth) terms. GPS normally uses great circle calculations for distance and desired track.
The distance above or below mean sea level
Extra POI Editor was written by one of our members TurboCC. It will convert .csv to .gpx, .gpx to .csv. It will create ,gpi files

Sometimes EPE gets "lost" and you have problems. A possible solution can be found by trying the steps in a FAQ written by VersatileGuy found at

If EPE seems particularly "slow" in loading a .gpx file, it may be because the file was saved in Unix format and has "line feed" (LF) endings. To correct the issue, open the GPX file in Wordpad (not Notepad) and just save back. This will convert those LF into CRLF. Then EPE will load the file in no time.

Abbreviation for Estimated Time Of Arrival
The estimated time you will arrive at a destination. Your device can actually learn from your driving and adapt its internal database to provide better estimates of your arrival time. The device will learn from a driver’s habits and adjust the ETA accordingly. This is done by observing what speed a driver typically drives on each speed category of road and using that data to compute ETA.
Express Mode
The mode POI Loader uses for loading POI files that do not need to be given Speed or Proximity Alerts
File Allocation Table (FAT) is the name of a computer file system architecture and a family of industry standard file systems utilizing it.

See SD card

On Nuvis, these are locations that a user wants to be available for quick navigation. These would include points of interest to which the user will be navigating soon. For example, a user might put in the location of the house at which they will be staying on an upcoming vacation. Having done so, during the vacation, navigation back to that house from other points in an unfamiliar city can be quickly accomplished.

On Streetpilots, "waypoints" are used instead of "favorites" The nuvi 200, 300, 500, 600, 700, 800, 805 series and the zumo 220, 400, 500 and 550 series can have 500 Favorites. The nuvi 5000 can have 3000. The rest of Garmins can have 1000.

Note that the mileage (distance) shown for Favorites is "as the crow flies". In order to get the actual road distance, one must create a route.

See: current.gpx

See: Saved

In electronic devices, firmware is the combination of non-volatile memory and the program code stored in it. The firmware provides the control program for the device. Periodically, suppliers will update firmware to correct errors or to add features.
There are a few different ways to find out what the latest firmware or software is for a Garmin GPS unit.


WebUpdater is a program installed on either a PC or Mac that will indicate if there is a firmware or software update for the GPS unit and will even download and install it. WebUpdater is a free download available by going to the Garmin website.

Additional Software Website

The latest firmware or software version for the Garmin GPS unit is also available by going to our Additional Software website. Select the model GPS unit from this page and then find the section labeled Unit Software. That will list the latest version that is available on our website.

Links Referenced in this Article:

WebUpdater: http://www.garmin.com/support/collection.jsp?product=999-999...

Additional Software Website: http://www.garmin.com/support/blosp.jsp

Garmin Communicator
The Garmin Communicator Plugin is no longer compatible with Google Chrome. The Communicator Plugin uses the Netscape Plugin Application Programming Interface (NPAPI) architecture which is no longer supported by Chrome. As of Chrome 42, NPAPI support has been disabled by default and these types of plugins will no longer be detected.

In order for the Garmin Communicator Plugin to work properly, a compatible browser must be used. For a list of compatible browsers, visit the Garmin Communicator Plugin download page for your operating system:



The Garmin Communicator Plugin will function correctly in these compatible browsers.

(from a CarigW post
This plug-in works well with Internet Explorer, but I've read that some of the other browsers require you to manually enable the plug-in after installing it to get things working for you. I don't know if this applies to you.

Also, note that Garmin Express and other Garmin software on a PC may also need the latest version of Windows Media Player.



(from a Dobs108 post)
I went to the Garmin site to check Garmin Communicator, a browser plug-in:


This web page checks for Communicator and installs it if needed. Communicator was already installed but it was being blocked by the browser (Chrome) and I had to click on "always trust content from Garmin." Communicator was now working. The same thing can happen to Internet Explorer.

See the post "Reverting back to older firmware" by Pillowcase about half way down in this thread: http://www.poi-factory.com/node/38782. Note that if your nuvi is an older model, you would copy the Gupdate.gcd file to the Garmin folder instead of the .system folder. (thanks to alandb for this info)

FM Traffic
If you lose the Traffic Icon, you might try the following

Credit goes to member DorkusNimrod for providing the procedure for older devices (I have supplemented it for newer devices).

1. From the map screen, press the speed indicator to go to the Trip Computer page.

2. Press and hold the round speedo dial for ~7 seconds

On Older devices
3. Press Next to advance to the GTM Info page.
4. Press Reset
This clears the FM table of the available scanned stations that it uses to select from when locking onto a transmitting FM station. This initiates a re-scan of the stations which may pick up newly available stations in the area you're in.

On NewerDevices
3. Press Developer Info
4. Press Down Arrow to advance to GTM FM Table
5. Press GTM FM table
6. Press the three bars in the upper left corner of screen
7. Press Reset

Format of SD Card for Garmin
It appears it should be FAT or FAT32
Garmin has information at this link
Foursquare is a POI database to help users explore new and popular restaurants, stores, and more. Certain newer Garmin devices come preloaded with this database.
Garmin Communicator
See notes under Firmware
Garmin Express (GE)
According to Garmin:
Garmin Express is your one-stop shop for keeping your nüvi®, zūmo® or dēzl™ up-to-date.

This software is for:

Update Maps
Garmin Express downloads available map updates to your computer automatically, and alerts you when new maps are ready to install. You can even control download speed and schedules.

Transfer Favorites
Garmin Express lets you transfer all your favorites from one device to another with one click.

Install Voices & Vehicles
Browse and install free custom voices and vehicles.

Back Up Files
Garmin Express makes it easy to back up and restore saved addresses, routes and waypoints to and from your computer.

If you need to download GE, here is a link:

If you want to check and see what changes have recently been made to GE, here is a link

Garmin Locate
A feature included on some Garmin automotive devices which will automatically mark the last position to help you find your way back to your vehicle.

To mark your last position on all devices with this feature, simply remove the device from the automotive mount. The device must be powered on and must have satellite signal to mark the last position. After removing the device from the automotive mount, you may power it off. You may then have the device route you back to the last position, if desired.

This data is saved in position.gpx

Garmin MapUpdater
This is the predecessor to Garmin Express and is preferred by many for downloading maps, etc. because it does not install itself in Startup
Garmim Model Introduction Dates
see this post by alandb
Garmin Real Directions
According to Garmin, Garmin Real Directions provide spoken instructions using not only street names but also recognizable landmarks, buildings, and even traffic lights. This helps minimize the need for you to find and read street name signs.
Garmin Real Voice
According to Garmin, Real Voice is the new sound of advanced guidance. Improved, intuitive navigation feels like driving with a friend. Garmin Real Voice uses refined speech technology to provide spoken instructions using a voice that sounds more realistic and friendly. These use .tts3 files.
Gatso is the brand that Gatsometer BV use on their traffic enforcement cameras, most notably their speed cameras and red light cameras.
The file that installs new firmware is gupdate.gcd Thus, it is a good idea to backup this file in case you need or want to roll back software on your device.
A high-tech version of hide-and-seek. Geocachers seek out hidden treasures utilizing GPS coordinates posted on the Internet by those hiding the cache.
See Maps
See Maps
See Maps
See Maps
See Maps
See Maps
GO button
The "GO" button will start the process of your unit routing to some location. However, there are situations where this will not be possible. The most common reason is when the "location" is associated with a speed alert.

According to Garmin:
If you have loaded any custom POI's that are speed or red-light cameras, you will notice that you will not receive an option to hit 'Go' to those locations.

This is designed to operate this way. The custom POI locations for such cameras will start with a number, and if it starts with a number, the software will read it as speed or red-light cameras.

Such locations would not be selected as destinations to travel, but just areas to be alerted of, which is the reasoning behind this design.

NOTE: whenever the POI file name contains a number (as long as it is smaller than 125 if using feet or smaller than 200 if meters), that number is interpreted by POI Loader as a speed alert.

Abbreviation for “Garmin Point of Interest” File. File used by Garmin personal navigation devices; stores the name and location of a user-defined point of interest; can be used to generate navigational routes as a destination or inter-route point.
Abbreviation for Global Positioning System.
A system which uses a constellation of 24 satellites to provide a precise location.

GPSR's contain a computer that "triangulates" its own position by getting bearings from three satellites to calculate a 2D position (latitude and longitude) and track movement. With four or more satellites in view, the receiver can determine the user's 3D position (latitude, longitude and altitude). Once the user's position has been determined, the GPS unit can calculate other information, such as speed, bearing, track, trip distance, distance to destination, sunrise and sunset time and more. (thanks to BobDee for this synopsis)

(see Note 1 at bottom of FAQ)
Derived from GPS eXchange Format.
It is an XML schema designed as a common GPS data format for software applications. It can be used to describe waypoints, tracks, and routes. The format is open and can be used without the need to pay license fees. Its tags store location, elevation, and time and can in this way be used to interchange data between GPS devices and software packages

The minimum properties for a GPX file are latitude and longitude for every single waypoint. All other elements are optional. Some vendors, such as Humminbird and Garmin, use extensions to the GPX format for recording street address, phone number, business category, air temperature, depth of water, and other parameters. Latitude and longitude are expressed in decimal degrees using the WGS 84 datum. Elevation is recorded in meters. Dates and times are not local time, but instead are Coordinated Universal Time (UTC) using ISO 8601 format.

A command line program written by Camerabob to clean up and standardize .gpx files. See link in Link section below

What GPXClean does (without asking):

What GPXClean will do: Compresses multiple spaces into a single space in the 'gpxx:StreetAddress' & 'gpxx:City' fields
Removes spaces from the beginning and end of anything in the 'gpxx:StreetAddress' & 'gpxx:City' fields
Log to a file any changes made that aren't case related (upper to lower, i.e.)
What GPXClean can do (optional):

Change the character case in the 'name' field
Change the character case in the 'gpxx:StreetAddress' & 'gpxx:City' fields
Change abbreviated road types into their long names (Rd to Road, Ave to Avenue, etc.) and remove trailing periods
Add/change/remove the country field
Modify the format of the phone number (to either xxx-xxx-xxxx, (xxx) xxx-xxxx or xxx.xxx.xxxx)
Append ' - ' to the POI name, to make it more unique
Make sure mcx stays McX (McAllen, McDonalds, McMillan, etc.) if 'normal' is set in Name (-poi) or City & Address (-case) fields
Make sure states are capitalized if 'normal' is set in Name (-poi) or Address (-case) fields
If -case is 'normal', it will capitalize directions (N, S, E, W, NE, etc.) and remove the period
Log to a file any format changes in the phone number

Greenwich Mean Time (GMT)
The mean solar time for Greenwich, England, which is located on the Prime Meridian (zero longitude). Based on the rotation of the earth, GMT is used as the basis for calculating standard time throughout most of the world.
Hard Reset
See Master Reset
A graphic symbol (usually a simple picture) that denotes a program or a command or a data file or a concept in a graphical user interface. The “Where To” symbol on you GPS is an Icon. Icon used to represent POI locations are provided by .bmp files.
A file on The SD card that lets Garmin developers keep track of cached data from the card, so they do not have to reread the whole card every time it is connected.
JPEG (also JPG)
A commonly used method of compression for digital photography (ie. images), The term "JPEG" is an acronym for the Joint Photographic Experts Group, which created the standard.
Junction View (see also Bird's Eye Junction View)
Junction View is a navigational aid that displays the appropriate lane you should be driving while in an active route. Junction View is not available in all areas and can be found on many intersecting interstates in major metropolitan areas. The Junction View image will automatically display on the map screen for approximately 10 seconds when you are less than a mile from that particular junction.

After the 2012.10 map update release, some devices will display Junction View in a split-screen mode. These devices are:
nuvi 40, 50, 60, 2300, 2400, 2405, 2407, 2408, 2505, 2507, 2508, 2707, 2708, 3400, 3500, 3507, 3508, 3700,series; the
dezl 560, dezl 760, LIVE 1695 and LIVE 2300 series; Camper/RV 760
Note: the JV will display for approximately 10 seconds and then revert to normal view. If you tap the lane assist area, JV will display for another 10 seconds.

The large Junction View file for 2014.1 is 769MB
The large Junction View file for 2014.2 is 780MB (D3060110A)
The large Junction View file for 2014.3 is 806MB (D3060120A)
The large Junction View file for 2014.4 is 816MB (D3060130A)
The large Junction View file for 2015.1 is 829MB (D3060140A)
The large Junction View file for 2015.2 is 835MB (D3060150A)
The large Junction View file for 2015.3 is 834MB (D3060160A)

Most Garmins use the smaller sized split screen by default. Some users prefer the Full Screen that would have to be downloaded separately. Both split & full view have the same amount of JCV files, the full screen is larger since the graphics are larger. The disadvantage of using the full screen is that it takes up more memory and only remains on for a few seconds. The split screen remains on until you pass the junction. (Thanks to muell9k for this info)

CraigW and alandb have stated

1) All models that receive the split-screen Junction Views are given the correct JCV file during map updates. (The one "exception" to this is the small group of split-screen device owners who prefer and are willing to manually download, install and then view the large full-screen JCV file and its views.)

2) Of the older devices that show full-screen JVs, it is the nuvi 1390, 14xx and 8x5 devices that receive the tiny JCV file from Garmin during map updates--and these are the devices that will benefit most from manually downloading/replacing the large JCV to their device.

3) Of the older devices that show full-screen JVs, it is only the 7x5 series that receives that large JCV from Garmin during map updates, and therefore they do not need to manually download or use the "large" JCV file.

The reasons for 2 and 3, above, are due to space issues on the older devices:


The first devices to get JVs were the 7x5 and 8x5, and the 1390 and 14xx series.

Although the 765 has the same 4GB capacity of the 855, the 855 storage had to hold voice recognition files, leaving little room for a large JCV file. Therefore, the 765 gets the large JCV while the 855 gets a special tiny JCV file during map updates even though they're both 4GB devices. The 1390 and 14xx devices were 2GB devices and therefore had too little space for the large JCV file as well, and therefore got the tiny one.

"Junction View" and "PhotoReal™ Junction View"
Is there any difference between "Junction View" and "PhotoReal™ Junction View" feature or they are same meaning. Please clarify

As to Garmin Web site:

Junction View Junction View is a navigational aid that displays the appropriate lane you should be driving while in an active route. Junction View is not available in all areas and can be found on many intersecting interstates in major metropolitan areas. The Junction View image will automatically display on the map screen for approximately 10 seconds when you are less than a mile from that particular junction.

PhotoReal™ Junction ViewNavigate tricky junctions with PhotoReal™ junction view for accurate images of upcoming exits and junctions on your route. nüvi 3790T shows your correct lane choice with incredible detail of what’s up ahead – down to the trees, bridges and pylons. See the precise reproduction of road signs with arrows guiding you to the right lane for your onward journey. Flip nüvi landscape-to-portrait to see PhotoReal™ junction view in split-screen for exceptional clarity. Combined with nuvi 3790T’s 3D terrain detail and contours, buildings and landmarks, the road ahead has never looked so vivid.

(thanks to Strephon_Alkhalikoi for finding this Garmin explanation)

Junction View (large file)
[thanks to CraigW for the following comments]
Questions often arise regarding the large jcv file each time a new map update comes out, especially from new users here at The Factory, such as: what is this file, do I need it for my GPS device, etc.

To me, there are basically two groups of people that will want to use the large JCV file, which requires manually downloading the file, copying it to the nuvi and disabling the default jcv file:

Group 1: These are folks with older nuvis that can display full-screen Junction Views but receive a very small file from Garmin during map updates. These folks have models including the nuvi 8x5, 1390, and 14xx. (The nuvi 7x5 model doesn't need to manually add the large jcv file because Garmin supplies it during the map update.)

Group 2: These are folks with newer nuvis who receive the split-screen Junction View images but wish to have the full-screen views fill their screen for a few seconds rather than have a longer view with a split screen divided between map & view. The consensus I read here at The Factory is that the vast majority of split-screen nuvi owners prefer the default split screen and therefore can ignore any large jcv file discussions.

If you don't fit into group 1 or 2, you can ignore all discussion of Large JCV files now and into the future. And as long as folks keep backups of their original jcv files and are familiar with file renames, copy&paste, etc., there's no harm in trying the large JCV file, since it can always be removed and replaced with the original Garmin-provided file.

Later CraigW added: with a split-screen, you maintain the ability to simultaneously see the map as well as the Junction View (which is good) but the View is smaller (less good if trying to read what's on the green exit sign, for example).

But your split-screen JV shows the view onscreen until you pass the View's location. With the full-screen View, the View remains on the screen for maybe 5 seconds or so, then disappears again, so you need to be quick in viewing it.

There are a number of character strings that have special meaning for Garmin devices. These include "GATSO," "mobile," "SPECS," "safety," "speed," "camera,". Another keyword is “TourGuide” (note it has to have a capital “T” and “G”.
An abbreviation for Keyhole Markup Language
KML is an XML notation for expressing geographic annotation and visualization within Internet-based, two-dimensional maps and three-dimensional Earth browsers. KML was developed for use with Google Earth, which was originally named Keyhole Earth Viewer. It was created by Keyhole, Inc, which was acquired by Google in 2004.

An example KML document is:
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
<name>New York City</name>
<description>New York City</description>

Lane Assist
Lane Assist guides you to the correct lane for an approaching turn or exit, making unfamiliar intersections and exits easy to navigate. On Lane Assist compatible devices the Lane Assist feature can be found in the top left hand corner of the screen
The angular distance between an imaginary line around the earth parallel to its equator and the equator itself. A position's distance north or south of the equator, measured by degrees from zero to 90. One minute of latitude equals one nautical mile.

Latitude must appear in WGS84 decimal degrees format (ddd.ddddd; negative numbers indicate South).

A file that contains information about various countries; eg.
TimeFormat, DateFormat, units, Currency (including Symbol, Separator, ISOCode, and SideOfString) and Language.

Lifetime Maps Terms and Conditions
If you purchase a nüMaps Lifetime subscription (sold separately) or if your Garmin product comes bundled with a nüMaps Lifetime or other lifetime map subscription, you will receive map data updates when and as such updates are made available on Garmin.com during the useful life of 1 compatible Garmin product or as long as Garmin receives map data from a third party supplier, whichever is shorter. A product’s “useful life” means the period during which the product (a) has sufficient memory capacity and other required technical capabilities to utilize current map data and (b) is capable of operating as intended without major repairs. A product will be deemed to be out of service and its useful life to be ended if no updates have been downloaded for such product for a period of 24 months or more. Unless otherwise stated, the updates you receive under the subscription will be updates to the same geographic area included with your Garmin product when originally purchased. In some instances, your Garmin product might not have sufficient memory remaining for you to load an update to the map data, in which case you will need to either (a) select reduced map data coverage for your updates, or (b) purchase separately a microSD™/SD™ card (if and as applicable to your Garmin product) and load all or a portion of the map data coverage for your updates to the card and insert the card into the microSD/SD card slot contained in your Garmin product. If neither of the measures in (a) or (b) can be used to address your product’s lack of sufficient remaining memory, then Garmin may conclude that the “useful life” of your product has expired. Garmin may terminate your nüMaps Lifetime or other lifetime map subscription at any time if you violate any of the terms of this agreement or your subscription. Your nüMaps Lifetime subscription or other lifetime map subscription may not be transferred to another person or another Garmin product.
(August 1, 2013)

For selling a device, that has lifetime maps, see

thanks to canuk for posting this info

Lifetime Updater (Garmin)
Garmin's first attempt to automate map updates for units with Lifetime maps. Never worked well and we don't think it's being worked on any longer.
Live Services (Garmin)
see also Smartphone Link
Garmin Live Services which are free include:
1. myGarmin messaging which informs you whenever software updates or services are available
2. Current local weather, including forecasts

Premium services include:
1. Live Traffic information which is updated every two minutes
2. photoLive traffic cameras show real-time photos from traffic cameras for learning about traffic and weather conditions.

The angular distance between a point on any meridian and the prime meridian at Greenwich

Longitude must appear in WGS84 decimal degrees format (ddd.ddddd; negative numbers indicate West). NOTE: In the US all longitude numbers will be shown as negative numbers

Manual Mode
The mode POI Loader uses for loading POI files when you wish to create POIs to which you want to be given Speed or Proximity Alerts
MapFactor Navigator is a free turn-by-turn GPS navigation app for Android phones and tablets using OpenStreetMaps data. Maps are installed on the SD card
Map Install
A program that allows you to pick which map regions to compile and install on your GPS or SD card. Not often needed unless you are installing extra maps (topo, 3rd party, etc.) or don't have enough space on your GPS for a full map installation.
Map Layers
Map layers allow you to view additional details on your map from the View Map screen. With map layers, you can add the following items to the map:
Places along the road
Trip Log
3D Buildings
3D Terrain
Map Manifest
Just before Garmin issues a map update (usually a week or so), the maps are uploaded to their servers and a "manifest" is available. To view this manifest go to (for example)
This is the manifest for the 2016.20 update. (it was uploaded on 8/2/2015) Changing the above from 2016.20 to 2016.10 will retrieve the 2016.10 update. Likewise, to see if the next map update has been uploaded to the server, you would change to 2016.30
see Garmin Mapupdater
Map Tools
feature for customizing displayed shortcuts for additional information while navigating. The information will show on the right-hand side of the View Map screen.
For a discussion see
(found in the Garmin, .system or Map folder)
gmap3d.img provides 3D views in certain areas
gmapbmap.img is the Basemap
gmapdem.img is a Digital Elevation Model that produces 3d shaded terrain on high end Nuvi models like the 3597 and 3790 if they are in 3D mode. (thanks to t923347) You will not see the 3D effect if the device is not in 3D mode or in a flat area. However, if you are in an area with mountains and you zoom it, the effect will appear.
gmapoem.img is a custom map used by certain businesses.
gmapprom.img is the main map
gmapsupp.img is a supplemental map (see Open Street Maps)
gmaptz.img is the time zone map

.unl files contain unlock codes of a minimum of 25 characters.
.sum files are diagnostic files and are not required for the .img files to work. They can be deleted

(thanks to alandb for the following)
These newer model groups come with the original map in the .system folder and support storing maps in a Map folder with flexible map naming: nuvi 30, 40, 50, 1100, 1200, 1300, 1400, 1690, 2200, 2300, 2400, 2405, 2407, 2505, 2507, 2707, 3400, 3500, 3507, 3700 series, dezl series, LIVE 1695, LIVE 2300 series, zumo 220, 350 or 665.

These older model groups came with the original map in the Garmin folder. They only support maps in the Garmin folder and have restrictive map naming rules: nuvi 200, 205, 295W, 300, 400, 500, 600, 700, 705, 800, 805, 5000 series, zumo 450, 550, or 660.

Maps can go on either internal storage or SD card as long as you put them in the correct folders as identified above and on the older units follow the correct naming conventions.

According to muell9k (for a 2460)
"To add additional maps to the Nuvi itself, create a folder in the root directory (NOT .sys folder).
Name that folder Map (M is capital a & p are small case). Now copy the map to that folder and name it anything you like, example is "My Europe Map.img".
As long as it has the .img extension it will be recognized. ... Just make sure the Map folder is properly named as indicated above. The map will appear in map info with the proper name...

Remember to check the available memory on the Nuvi and the map size of the map you want to add to confirm there is enough room to copy the file to the Nuvi.

The same above procedure can be used when adding additional maps to an SD card.

Software by Garmin. See http://www8.garmin.com/support/download_details.jsp?id=209

To use Mapsource, you must have downloaded a map to your computer itself (it will not recognize a map on your Garmin unit)

Mass Storage Class
Mass Storage Class (MSC) devices are not limited to an USB memory stick. Various devices can be connected to an USB Host using MSC: SD cards, internal or external Flash memory and even a simple RAM disk. The USB Component supports the MSC Class for USB Device and USB Host applications.
Mass Storage Mode
Most Garmin Devices will connect to the computer in Mass Storage Mode. See http://developer.garmin.com/web-device/garmin-mass-storage-m...

However, the following models connect in Media Transfer Protocol (MTP) mode:
Camper/RV series; dezl 570, 760 and 770; nuvi 55, 56, 57 and 58; nuvi 60 series; nuvi 2405, 2407, 2408, 2505, 2507, 2508, 2509, 2609, 2707, 2708, 2709, 3400, 3500, 3507, and 3508 series; zumo 350; zumo 390; zumo 590

Master Reset
The process of returning a GPS device to factory defaults. A master reset will erase all favorites and will restore your device to the default factory settings. See http://www.poi-factory.com/node/30019
An imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator
The common reference toMPEG-1 or MPEG-2 Audio Layer III
MP3 is an audio file format – actually compression format - that allows for audio files to be compressed into a smaller file size using a specific algorithm
Abbreviation for Mass Storage mode. This mode is used on all older Garmin devices and lets the device attach to the computer as a removable drive. Note that MS is also used as an abbreviation for Microsoft
Abbreviation for Media Transfer Protocol. Garmin says this provides a more secure environment for the important system files on your device. MTP is used on
Camper/RV series; dezl 570, 760 and 770; nuvi 55, 56, 57 and 58; nuvi 60 series; nuvi 2405, 2407, 2408, 2505, 2507, 2508, 2509, 2609, 2707, 2708, 2709, 3400, 3500, 3507, and 3508 series; zumo 350; zumo 390; zumo 590

See also MS

For tips on how to change from MTP to MS, see http://www.poi-factory.com/node/34909, and

or try this
1. To make all of Nuvi files visible, you must unhide protected files via Folder Options.
2. Start NUVI by itself and go to Volume Screen.
3. Press the upper right hand corner of screen for 10 seconds.
4. The Developers Screen will pop up
5. Scroll down to MTP SETTINGS
7. Shut down NUVI and hookup to Computer USB cable
8. The computer should recognize it is hooked up to the computer.
9. Explorer will now see all files in ROOT directory and the .System directories.

or perhaps
In the map, touch the speed to get to the dashboard screen.
Touch the speedometer for a few seconds (about 5).
Scroll down to the MTP setting and select Mass Storage.

your personal account on the Garmin website with details of your GPS, whether map updates are available etc.
The myTrends feature is available on select Garmin products. When you travel regularly to saved destinations, your device will, over time, begin to figure out where you’re going even without your telling it. Your device will provide a predicted route which will display in the information bar at the top of the map screen. myTrends provides time of arrival and relevant traffic information in the information bar.
dezl 570, 760, 770
nuvi 55/56/57/58/60 series; 2407/2408/2507/2508/2509/2609/2707/2708/2709/3400/3500/3507/3508 series
LIVE 1695, 2300 series
zumo 390, 590
as of 8/15/2015
The name sometimes given to the GPS satellite system NAVSTAR is an acronym for NAVigation Satellite Timing and Ranging.
A model line of Garmin Devices. This line was first introduced in 2005. For Approximate dates of various models see Note 2
One Shot
Some devices that use voice-activated navigation allow you to perform One Shot address entry and One Shot point of interest (POI) searches. This means that you are now able to say the full address or POI in one continuous sentence to locate the destination rather than using multiple voice commands for the house number, street, city, and state.

The One Shot address entry and POI searches feature is currently only available on the following devices:

dezl 570, 760 and 770;
nuvi 2495, 2497, 2498, 2577, 2589, 2595, 2597, 2598, 2599, 2689, 2789, 2797, 2798, 3490, 3590, 3597 and 3598

Open Street Maps
Open Street Maps are routable maps that can be used as on a SD card in a Garmin Folder and named gmapsupp.img. See http://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin/Downloa...

ov2 files contain point of interest (POI) data for TomTom devices.
A program furnished by Microsoft that can manipulate images
A single display element on an LCD screen. The more pixels, the higher the resolution and definition

Abbreviation for Points of Interest.

Garmin devices come with millions of built-in POIs.

poi-factory speed cameras
The speed camera file contains both the US and Canada. It is able to do this because the Canadian speed cameras have had their speeds converted from km/h to MPH in the file. The following example entry from the file illustrates this.

-114.06112,51.03786,1 & 17 @31.1,AB Calgary

When you convert MPH to km/h by multiplying 31.1 by 1.61. The result is 50.071, or 50km/h.

Canadians should set your distance measurements on the GPS to kilometers; then, the results are automatically converted back to kilometers

Set POI Loader to feet and MPH (because that is how the speed file is structured).
(Thanks to Strephon_Alkhalikoi for this explanation)

The POI-Factory's file has a speed alert built in. The distance from the light the alert triggers depends on your speed. According to POI Loader, the distance is 36 seconds before you would reach the coordinates. That translates to a variable distance as it depends on your speed.If you are traveling above the alert speed, the alert keeps repeating
until you are at the speed or below.
(Thanks to Box Car for this explanation)

POI Loader
Garmin’s program to load Points of Interest Files into one of its GPS devices See http://www8.garmin.com/support/download_details.jsp?id=927

To Find out what version of POI Loader you are using, click on the symbol in the very top left of the dialog box and choose About POI Loader.

The current versions of POI Loader will be installed into C:/Program Files (x86)/Garmin/POI Loader.

See also http://www.poi-factory.com/node/32154 for a discussion on POI Loader's ability to correct whenever lon and lat are reversed.

The 3-D coordinates of a point, usually given in the form of Latitude, Longitude, and Altitude,
The last location is saved for some Garmin units. See Garmin Locate.
Prime Meridian
The zero meridian, used as a reference line from which longitude east and west is measured. It passes through Greenwich, England.
Proximity Alert
An audible indication that the GPS device has come within a specified distance of a POI
Most Garmin devices will verbally inform you that they're recalculating your route if you miss a turn or veer off the calculated route. Devices that no longer verbally indicate that they're recalculating your route are as follows:

Camper/rv series
dezl series
LIVE 2300 series
nuvi 30, 40, 50, 60, 2400, 2405, 2407, 2408, 2505, 2507, 2508, 2509, 2609, 2707, 2708, 2709, 3400, 3500, 3507, 3508 series
zumo 350, 390, 590

Recently Found
A Garmin device will store up to 50 locations in "Recently Found"
A group of waypoints entered into the GPS receiver in the sequence you desire to navigate them.
In GPS navigation, a "route" is usually defined as a series of two or more waypoints. To follow such a route, the GPS user navigates to the nearest waypoint, then to the next one in turn until the destination is reached
There are many discussions about why a GPS units produces a route that is not what the user thinks it should be based on local knowledge. A good commentary can be found at http://www.poi-factory.com/node/5594#comment-329943
Safe Mode
On a Garmin, Safe Mode limits the device's functionality while the vehicle is in motion
Satellite Reception
(Thanks to CraigW for these reasons for long acquisition time)
1.firmware Some changes in the past I think resulted in improved satellite reception.
2.Not having used it for a while. This should be a one-time delay. You need a good 15 minutes or so of satellite reception to reacquire the almanac that will hasten future start ups.
3.Starting up the device in a location far from where it was last used;
4.Having the device try to acquire satellites while moving. The quickest startup will be obtained when stationary.
5.A start up in a confined area.
See Favorites
SD Card
SD is an abbreviation for Secure Digital although in common usage people associate the abbreviation with the manufacturer SanDisk. MicroSD cards are used to provide additional storage for GPS units. Many older units do not have enough internal memory to hold the latest maps, so a SD card is required.
For Garmin units, the latest information on size is
As long as the automotive device has the latest version of software, the device can use the following maximum card size from the table below. Please use the WebUpdater program at the following link to download the latest device software version: http://www8.garmin.com/support/collection.jsp?product=999-99...

Unit Series...............................Maximum Size SD Card
Camper/RV series -                                                         32GB
dezl series -                                                                       32GB
dezlCam (Camera SD card slot) -                             64GB
dezlCam (Map SD card slot)-                                       32GB
Garmin Dash Cam 10 and 202-                                   32GB
GVN 52 and 53-                                                                   8GB
KNA-G510 -                                                                           8GB
LIVE series -                                                                         32GB
nuvi series -                                                                         32GB
(except the nuvi 295, 800, 805, and 5000 series)
nuvi 295, 800, 805, and 5000 series -                         8GB
nuviCamLMTHD (Camera SD card slot) -               64GB
nuviCamLMTHD (Map SD card slot) -                       32GB
StreetPilot c300 series 5 -                                             2GB
StreetPilot c500 series 3 -                                             4GB
StreetPilot i-Series 5 -                                                     2GB
StreetPilot 7200/7500 -                                                   2GB
zumo 220, 350, 390, 590, and 600 series -             32GB
zumo 400 and 500 series -                                             4GB
zumo 665 -                                                                           8GB

Depending on the model of the device, it may use either a full size SD card or a microSD card, please refer to its documentation for more information. When using a card with a larger capacity and when the files on the card are large in number and/or size, the device's ability to draw mapping may be slowed.

For OEM dealer devices, please refer to the series above that fits the device.

1Using an SD card size larger than 8GB is not supported for these devices. However, using one will not harm the device but it may or may not work. Also, Garmin supports all speed ratings (including unmarked cards).

2StreetPilot c300 and i-Series units do not currently support the SDHC (High Capacity) cards. All other devices will support SDHC (High Capacity) cards and will support up to class 10 cards.

SD cards should be formatted as FAT32. Note that FAT32 will not allow a single file to be greater than 4G.
Thanks to muell9k for this info on FAT32

Search Conflicts
whenever you go to another continent that you have a map for, uncheck all other maps so the search feature performs properly. A problem with search failures occurs because each of the maps may contain additional "territories" also (properly) associated with the other map. (Thanks to muell9k for this tip)
Shaping Points
Shaping points are like "via" points except that they will guide navigation but will not alert when reached. Using Trip Planner you can enter 125 shaping points after you have entered at least 3 waypoints.
You can have a maximum of 36 shortcut icons displaying on the Where To? menu of the following devices: nuvi 2405, 2407, 2505, 2507, 3400, 3500, 3507 series, zumo 350, dezl 760
Smartphone Link (Garmin)
See also Live Services
Sometimes referred to as "Smart Link", Smartphone Link (*) is an app from Garmin that pairs a compatible Garmin device with a compatible smartphone.
Soft Reset
The nuvi has a soft reset feature to power it off should it appear to be frozen. To power the device off with the soft reset: Slide the power key to the left
Hold it in that position for about 10-15 seconds
Software that will permit POI Loader to use .wav files for audio alerts. Must be in the same folder in Program Files in which POI Loader.exe resides.
See Links below.
Speed Alert
An audible indication that the GPS device is exceeding a speed set by the user when approaching some POI
Splash screen
A couple of aids to making your own splash screen

muell9k wrote:

You can use your own jpg image and resize it free online.

You can do a google search for keywords "free online jpeg editor" and will bring up many sites.

Below is a link for one.

Here you can change the Pixel size to the 800 X 400 and add text if you like. To see what Garmin uses for pixel size on your 3790, select one of the available stock pics on the Nuvi and open it with the online editor. DON"T SELECT any of the 3 with Garmin locations. Whatever that size is would be what I would use for the pixel size. You may want to consider using 480 X 232 to compare to the 800 X 400 and see what you like better.

Split Screen
see Junction View
Streets - which street does a device show at top?
Garmin says:
Why does my device show me the street I am driving on instead of cross streets?

With the latest version of software, your device may have changed the way the roads are shown on the map when you are not in a route.

If you are on a secondary road, the green information bar will only show the road you are traveling on. See picture below:

If you are on a highway, the device will show upcoming exit numbers if available. If the exit numbers are not available, it will display street names. See picture below:

Below is a list of devices that will show the cross streets instead of the street you are driving on, in the green information bar:

delz 560 and 760
nuvi 30, 40, 50, 52 & 54 series
nuvi 2200 series
nuvi 2300 series
nuvi 2400 series
nuvi 2405 series
nuvi 2505 series
nuvi 3400 series
nuvi 3500 series
nuvi 3700 series
zumo 220, 350, 390, 450, 500, 550, 660 and 665

The following devices will show the cross street at the top of the map screen, and the current street at the bottom:

Camper/RV series
dezl 570, 770
nuvi 55 & 56
nuvi 57 & 58
nuvi 60 series
nuvi 2407 series
nuvi 2408 series
nuvi 2507 series
nuvi 2508 series
nuvi 2509 series
nuvi 2609 series
nuvi 2707 series
nuvi 2708 series
nuvi 2709 series
nuvi 3507 series
nuvi 3508 series

Supplemental Maps
To delete supplemental maps, see https://support.garmin.com/support/searchSupport/case.faces?...
The colors used for various elements of the map display
TourGuide File
A TourGuide file is a type of Custom POI file that will "alert" whenever you are within some "Proximity Radius" of a location. Think of the "Proximity Radius" in terms of a "Circle" whose radius is the desired proximity distance and whose center point is the POI location. This "alert" should be distinguished from the normal "Along the Route" alerts which activate at the proximity distance along the road on which the unit is traveling if the POI location will be within 30 meters of the road as the unit passes it.

The file name of a TourGuide file must somewhere contain the character string "TourGuide" (with a capital "T" and a capital "G"). Further, there must be a sound file (either a .mp3 or .wav) which has exactly the same name to the left of the extension as the .csv or .gpx file. Note: for those units which do not have a MP3 player, two things are required. the .wav file must be in the same folder as the POI file; and, a specific version of a program called sox.exe must reside in the same folder as POI Loader.

The direction of movement relative to a ground position
Track Log
Track logs are points automatically stored when the GPS is moving. It is the electronic equivalent of laying down a breadcrumb trail to mark the path that has been traveled.

These points will be shown strung together on the map page of the GPS for the purpose of returning along the same path.

You can import Tracks into BaseCamp and convert them to a route. See https://support.garmin.com/support/searchSupport/case.faces?...
(Thanks to bdhsfz6 for the link)

Traffic Trends
The following devices have trafficTrends:

dezl 560, 760 and 770
LIVE 1695, 2300 series
nuvi 55, 56, 57, 58, 60, 2300 series (except the 2300 model), 2407, 2408, 2507, 2508, 2509, 2609, 2707, 2708, 2709, 3400, 3500, 3507, and 3508 series
zumo 350
zumo 390
zumo 590

muell9k reported in http://www.poi-factory.com/node/41581#comment-348082


SID Files Identified
There seems to be very little information regarding Garmin’s .SID files.

I was able to identify the ID numbers and what their functions are for the 2014.30 North America maps.
I would of NOT delete those files since it may cause your Nuvi not to function properly on some features.

D2656130A.sid = external point addressing
D3157100A.sid = instasearch
D3406100A.sid = traffic trends
D3398100A.sid = fast routing

Trip Log
Trip logs are points automatically stored when the GPS device is locked onto a satellite signal and moving. It is the electronic equivalent of laying down a "breadcrumb trail" to mark the path that has been traveled.

A nuvi, LIVE, or zumo device can store 10,000 points before it begins the process of archiving additional logs.1 Beyond 10,000 points the device moves the oldest trip data into an internal archive file. Up to 20 archive files can be stored internally on the unit. This means, depending on space available, the device can store over 200,000 points of trip data.

Archived trip log information is not visible on the device itself, but can be used and seen with Garmin's MapSource or BaseCamp programs.

To open and view individual archives:

Open the Garmin drive
This is located in Computer or My Computer on Windows
This is located on the Desktop on Mac
Open the Garmin folder
Open the GPX folder
Open the Archive folder
Each archived GPX file can be opened in MapSource or BaseCamp.

These can also be opened as individual archives from within BaseCamp by following these steps:

Connect the device to the computer
Open the BaseCamp program
Click on the device or Internal Storage, under Devices
Click on an active route
*Note: MapSource will not install without a previous version of MapSource mapping already installed to the computer. If mapping software is not available, BaseCamp would be the application to use. The mapping applications can be downloaded from this link: http://www8.garmin.com/support/mappingsw.jsp

1The Archive file feature can be found on all nuvi, LIVE, and zumo models EXCEPT the following:

nuvi 200 series
nuvi 300 series
nuvi 600 series
nuvi 700 series

Thanks to CharlesD45 who posted this Garmin FAQ

To clear the trip log on a nuvi 30, 40, or 50 series device:

You will need to perform a master reset.

Note: A master reset could erase all waypoints or favorites and will restore your device to the default factory settings. If you would like to back up your favorites to your computer, you can find instructions to do so here.
Start with the device off and unplugged from power
Touch and hold the lower right corner of the screen with an index finger or the eraser of a pencil
Continue touching and holding the lower right hand corner of the screen then power the device ON
Release the power button when the device powers ON
You will see a new message: "Do you really want to erase all user data?"
Remove your finger from the screen when this message displays
Touch Yes
If text language is not in English, this is the button on the right
The device will now reset. Follow the on-screen prompts and then place your device in an area with a clear view of the sky until it acquires satellites.

Thanks to muell9k who posted this Garmin FAQ

Trip Planner
Trip Planner is a feature of newer devices that allows a user to plan a multiple-point route/trip allowing you to navigate among several points. Trip planner is limited to 30 points. If there are at least 4 points, the route can be optimized.
User Interface
The way in which information is exchanged between the GPS receiver and the user This takes place through the screen display and buttons on the unit.
A file in the .System folder of newer Garmin units that seems to keep a track of the various screen and button presses.
Universal Serial Bus.
The USB standard uses "A" and "B" connectors to avoid confusion:
"A" connectors head "upstream" toward the computer.
"B" connectors head "downstream" and connect to individual devices.
By using different connectors on the upstream and downstream end, it's impossible to ever get confused -- if you connect any USB cable's "B" connector into a device, you know that it'll work. Similarly, you can plug any "A" connector into any "A" socket and know that it'll work.

any microUSB cable should work on any nuvi that requires it. There is no special wiring/resistor/whatever in a standard data cable because the data cable is meant solely for that purpose. That being said, *some* cables do have the resistor built in and those are what usually put the nuvi into charge mode. The special resistor embedded in the cable/internal pins is mostly meant for a cable that supplies power to the unit (like an external AC adapter) to charge it.

The pinout from Garmin site is

Abbreviation for Coordinated Universal Time
Formerly referred to as GMT or Greenwich Mean Time

The switch to daylight saving time does not affect UTC. It refers to time on the zero or Greenwich meridian, which is not adjusted to reflect changes either to or from Daylight Saving Time. (thanks to muell9k for pointing this out)

A planned stop point on a route. See Waypoint
A smartphone app from Garmin.
According to Garmin support, purchasing the app will give you lifetime updates (although the update may only be once a year).
"All mapping comes with lifetime updates, including the streaming mapping. We are releasing at least one update per year, if not the 4 yearly updates available to our PND devices." (from a reply to Charlesd45)
At the moment Custom POIs are not supported. The viago application is unable to import routes or GPX files. Routes and Points of Interest must be created and saved within viago itself. (from Garmin Support)

Voices Text to Speech
There are a few Garmin Voices that offer text to speech. To see whether you are using the latest version, see http://www.poi-factory.com/node/40282
Abbreviation for Wide Area Augmentation System
A system of satellites and ground stations that provide GPS signal corrections for better position accuracy. A WAAS-capable receiver can give you a position accuracy of better than three meters, 95 percent of the time. (At this time, the system is still in the development stage and is not fully operational.) WAAS consists of approximately 25 ground reference stations positioned across the United States that monitor GPS satellite data. Two master stations, located on either coast, collect data from the reference stations and create a GPS correction message.
Note: of all the nuvis, only the 300 and 600 series have this feature.
Acronym for Waveform Audio File Format
A Microsoft and IBM audio file format standard for storing an audio bitstream on PCs. Came to be known as WAV because of its filename extension (.wav)
A coordinate in a navigation device, such as a GPS receiver, representing a position - usually two-dimensional. Waypoints are locations or landmarks worth recording and storing in your GPS. These are locations you may later want to return to. They may be check points on a route or significant ground features. (e.g., camp, the truck, a fork in a trail, or a favorite fishing spot). Waypoints may be defined and stored in the unit manually by taking coordinates for the waypoint from a map or other reference. This can be done before ever leaving home. Or more usually, waypoints may be entered directly by taking a reading with the unit at the location itself, giving it a name, and then saving the point. Waypoints may also be put into the unit by referencing another waypoint already stored, giving the reference waypoint, and entering the distance and compass bearing to the new waypoint.

Note that Streetpilots use the term "waypoints" to indicated saved locations; for Nuvis, saved locations are called "favorites".

Using Trip Planner you may enter 30 waypoints (and 125 shaping Points). nuvis that allow routes (but do not have Trip Planner) can have 200 waypoints.

WebUpdater is a program installed on either a PC or Mac that will indicate if there is a firmware or software update for the GPS unit and will even download and install it. WebUpdater is a free download available by going to the Garmin website.

Webupdater allows you to find and install all available updates to your GPS except maps. Garmin Express will be the successor to this program.

Windshield Mounting
a link to state laws
xImage is old Garmin software that allows you to retrieve and update images on your GPS. For example, xImage makes it possible to get a screenshot from most GPS models. In addition, with certain newer models, xImage allows you to update some images (splash screen, waypoint symbols, etc.) with your own creations.
Zip files
Some updates downloaded via WebUpdater (or otherwise) as distributed via compressed .zip format. Upon the next boot cycle (after the update), these are extracted and then the contents are moved to their proper locations. The .zip file(s) are usually deleted after the boot/update process, but not always.

The file names of these .zip files correspond to a particular part number. The part number can be traced to a description of the part if you look through the GarminDevice.xml file on the nuvi. Since the GarminDevice.xml is specific to your model, part numbers may not coincide with other Garmin models. For instance, part numbers on my 3490 may or may not match with those on your 2460.

In my experience though, I'm pretty certain the *.glx files you are seeing in the .zip archives are Garmin text file updates.
(thanks to DorkusNimrod for this explanation)

Zoom Levels (North American Models
The normal zoom level, when not navigating a route is .2 miles. As long as there is no route, it will stay there. You have to manually zoom in to see more detail. As far as during a route, the zoom level will stay at .2 until your speed reaches 59 1/2 mph, then it should zoom out to 1.2 miles. You can change this by using the manual zoom in or out. The unit will remember this while routing.

When you slow to 45 mph or lower it will zoom in to .2 again. As noted above, as you approach a turn or significant navigation point the unit will zoom in as close as 80 feet, but after you pass this point, it will zoom back the level your speed dictates.
(thanks to phranc for this explanation)

Many terms are direct quotes from a glossary furnished by Garmin.
Refer to other terms in Garmin’s own glossary at http://www8.garmin.com/aboutGPS/glossary.html




Basecamp 4.5.1
for Win
For Mac

Batch Goecoding (up to 50) EXCELLENT


CiteBite (Link Directly To Quotes In Web Pages Or POI Factory Forum)

Coordinate "Flipping" Utility For The Windows Clipboard
(Submitted by VersatileGuy)



GARMINCURE3 & UPDATER, http://dl.dropbox.com/u/55759275/GarminCure3.zip

Garmin Communicator Plugin:

Garmin Current Model List

Garmin Discontinued Models

Garmin Express

Garmin JCV (large file)
see http://www.poi-factory.com/node/44985

Garmin Manuals

Garmin Mapping Software (various - gives dates - use this link to get Mac versions))

Garmin MapInstall

Garmin Mapsource:

Garmin Map Updater PC:

Garmin Map Updater Mac:

Unfortunately this link now says that it is set to private, but thanks to CraigW
the PC and Mac versions still can be downloaded:
For the PC: http://download.garmin.com/lmu/GarminMapUpdater.exe
For the Mac: http://download.garmin.com/lmu/GarminMapUpdater.dmg

Garmin Updates for various devices from GMapTool
NOTE: Pick the link for your specific device


Garmin USB device drivers

Gary Hayman's Tricks, tips, etc

Google Earth

Google Maps

ITNConverter - converts various GPS files to other GPS formats

Junction View - large file for 2017.10
Part 1
Part 2
Use WinRAR (http://www.rarlabs.com) or 7-zip (http://www.7-zip.org) to extract.
(Thanks to Strephon_Alkhalikoi for links

Make your own .wav files


thanks to muell9k and charlesd45 for research

This online tool has several voices

charlesd45 found us a good desktop solution called Balabolka. It can be downloaded from
in either an installable or portable version (zip file). If you download the ZIP package, extract it to a folder of your choice. Launch balabolka.exe

For either version, input your text and Click File > Save Audio File > type file name (For Save as type click down arrow and select wav or mp3)

The old link (http://www2.research.att.com/~ttsweb/tts/demo.php) is no longer working


While this engine is fairly slow is producing the first sound file, it has six voices (3 male and 3 female), very good pronunciation and the ability to pick a "slow" speed. After you are presented with a new page containing the output, you click on the black bar to hear the file. You right click on "download audio file" and choose "Save link as..." Unfortunately, it only produces .mp3 files

To return to the page where text is entered, you click the "back arrow" of your browser.

The next file from text you create seems to go fairly quickly.

MediaIO (to convert one format to another, say .mp3 to .wav)

Navteq Map Reporter
Use this link to report errors in Navteq maps
(thanks to Groundhog)

Navteq Traffic Map
Use this list to find a major metropolitan are near you and see if the coverage includes your location
(thanks to muell9k for the link)

Notepad++ http://portableapps.com/apps/development/notepadpp_portable

(Submitted by VersatileGuy)

OV2 Scanner Utility
(Submitted by VersatileGuy)

POI Converter (works online)

POI Loader



SoundConverter (for Mac users)

SHARCNET (from screen repairs)


Speed And Red Light Camera Laws By State

SymbolExtractor http://turboccc.wikispaces.com/SymbolExtractor#Symbol%20Extr...

Test .wav file

Videos for Various FAQs
nstructions and other information are provided via on-screen text.

Video 1 - How to make a backup of your Garmin GPS

Video 2 - How to show file extensions on your computer

Video 3 - How to show hidden files on your computer

Video 4 - How to get voice alerts using WAV files for models without MP3 capability

Video 5 - How to set up and load custom POIs

Video 6 - How to build alert distance into a gpx file

xImage version 2.3 as of March 23, 2005


CSV is a very simple data format. It basically supports four columns of data, and two of those are used for latitude and longitude. The others can be anything, but the third is usually the name and the forth is a catch all that people just throw everything else in, unfortunately often very unorderly and often even inconsistently. It is easy to make and easy to edit.

GPX is a much more structured form of data written in an XML format. The data tends to be well organized (although that says nothing about the accuracy). Each field is labeled, so it should be more straight forward to see what the data actually is. The file is much larger, with each entry typically taking many lines rather than a single line in a CSV file.

Both of these files are actually just text files, so you can open and examine them in any text editor (such as Wordpad). Looking at them will give you a much better understanding than I can convey here.

Because data is just dumped into CSV files but neatly organized in GPX files, some features require GPX files for full utility. For example, if your Garmin GPS has a Bluetooth option and you want to use it to call the phone number of a POI from the GPS, that POI file must be in GPX format, it will not find the phone number if just thrown in with everything else into field 4 of a CSV file.

Thanks to Frovingslosh for this excellent explanation

Note 2:
Garmin Nuvi Models - Approximate Release Date History
This Information comes from a Post by alandb (see http://www.poi-factory.com/node/37811). Many thanks to Alan

10/2005 300, 350
06/2006 310, 360, 370
09/2006 610, 660, 670
04/2007 2x0, 600, 650, 680
07/2007 2x0W
08/2007 7x0
02/2008 5000
03/2008 2x5, 2x5W, 900
06/2008 8x0
07/2008 5x0
08/2008 7x5
03/2009 8x5
04/2009 12x0, 13x0, 465T
07/2009 14x0
10/2009 1690
04/2010 37x0
05/2010 295w, 1100
09/2010 23xx
11/2010 live 1695
02/2011 24x0, dezl 560
05/2011 22xx
10/2011 30, 40, 50, 24x5, 25x5, 34xx
01/2012 35xx
10/2012 dezl 760
01/2013 42, 44, 52, 54
03/2013 24x7, 25x7, 27x7
04/2013 3597

07/2014 Zumo 590

Garmin introduced the first nuvi's back in 2005 as a major upgrade in product design from the legacy StreetPilot series. Since that first nuvi 300, there has been a steady stream of new model anouncements in this series. The model numbering sequence and feature sets are far from logical and can cause confusion in our discussions in the forum. I thought it would be helpful and interesting to have a comprehensive reference list of the various model groups and their approximate release dates.

I compiled the above list with web research. The dates may not be exact, but I think they are in the ball park. Please submit any corrections you have and I will update the list.

I included the dezl and live 1695 models in the list since they are so closely related to the nuvi in function. I would be happy to add the StreetPilot and Zumo models if anyone has the release date information for the various model groups in those series.
See Wikipedia info at http://en.wikipedia.org/wiki/List_of_Garmin_products

Other pages

Change History

  • jgermann - Aug 12, 2020
    08/12/2020 removed dead link to Perry site

  • jgermann - Feb 19, 2020
    02/19/2020 add link to Gary Hayman

  • jgermann - May 13, 2019
    5/13/2019 added a working link for POISync

  • jgermann - Nov 21, 2016
    11/21/2016 added link to state laws

  • jgermann - Aug 6, 2016
    08/06/2016 added link to Data Management for Basecamp

  • jgermann - Jul 30, 2016
    07/30/2016 added links for updates

  • jgermann - Feb 7, 2016
    02/07/2016 added CiteBite to links

  • jgermann - Jan 29, 2016
    01/29/2016 added link to large .jvc file for 2017.10

  • jgermann - Jan 14, 2016
    01/14/2014 Added Links to FAQ Videos

  • jgermann - Nov 27, 2015
    11/27/2015 added fromtexttospeech.com

  • jgermann - Nov 19, 2015
    11/19/2015 Added link to Balabolka to make your own .wav file

  • jgermann - Sep 29, 2015
    09/29/2015 added Zoom Levels

  • jgermann - Aug 21, 2015
    08/21/2015 deleted links no longer active

  • jgermann - Aug 19, 2015
    08/19/2015 changed the link on making a .wav file yourself

  • jgermann - Aug 19, 2015
    08/19/2015 updated model numbers

  • jgermann - Aug 19, 2015
    08/19/2015 updated SD size table

  • jgermann - Aug 14, 2015
    8/14/2015 entered the limits on waypoint/shaping points

  • jgermann - Aug 2, 2015
    08/02/2015 link to comments on DEM

  • jgermann - May 11, 2015
    5/11/2015 removed dead links

  • jgermann - May 9, 2015
    5/9/2015 added link to USB drivers

  • jgermann - Apr 16, 2015
    3/16/2015 added Shaping Point

  • jgermann - Mar 16, 2015
    3/16/2015 added several links

  • jgermann - Mar 15, 2015
    03/15/2015 added info on SID files

  • jgermann - Mar 12, 2015
    3/12/2015 added another link to GE

  • jgermann - Feb 27, 2015
    02/27/2015 added info only nuvi 300/600 series have WAAS

  • jgermann - Feb 21, 2015
    2/21/2015 added Foursquare

  • jgermann - Nov 26, 2014
    11/26/2014 updated large JCV file sizes

  • jgermann - Nov 21, 2014
    11/21/2014 batch geocoder link suggested by almostbob

  • jgermann - Nov 18, 2014
    11/18/2014 added link to POI Converter online

  • jgermann - Sep 30, 2014
    9/30/2014 added safe mode and Garmin claim that avoidances might need to be reset after map updates

  • jgermann - Sep 25, 2014
    9/25/2014 added link to tracks to route

  • jgermann - Sep 25, 2014
    09/25/2014 added that you can use Basecamp to convert tracks

  • jgermann - Aug 23, 2014
    08/23/2014 added that Cyclops does not fork for 2013 on models

  • jgermann - Aug 23, 2014
    08/23/2014 added link to ITNConverter

  • jgermann - Jul 4, 2014
    7/4/2014 added id.txt

  • jgermann - Jul 2, 2014
    7/2/2014 added to viago

  • jgermann - Jun 26, 2014
    6/25/2014 added Cyclops

  • jgermann - Jun 26, 2014
    6/25/2014 Added Viago

  • jgermann - Jun 19, 2014
    6/19/2014 updated Trip Planner

  • jgermann - Jun 12, 2014
    6/12/2014 added info on GPS

  • jgermann - Jun 5, 2014
    6/5/2014 Updates to JCV (thanks Craig)

  • jgermann - Jun 5, 2014
    6/5/2014 Added CraigW comments on small vs large JCV

  • jgermann - Jun 5, 2014
    6/5/2014 update info about JCV

  • jgermann - May 24, 2014
    5/24/2014 added link to GMapTool updates for nuvi

  • jgermann - May 20, 2014
    5/20/2014 updated Basecamp version in link area

  • jgermann - May 17, 2014
    5/17/2014 added comments to JVC

  • jgermann - May 17, 2014
    5/17/2014 added DEM digital elevation model

  • jgermann - May 14, 2014
    5/14/2014 added link to Navteq traffic coverage

  • jgermann - May 14, 2014
    5/14/2014 added Navteq mapreporter link

  • jgermann - May 14, 2014
    5/14/2014 added Bluetooth

  • jgermann - May 14, 2014
    5/14/2014 added Live Services and Smartphone Link

  • jgermann - May 9, 2014
    5/9/2014 Added Trip Planner

  • jgermann - May 7, 2014
    5/7/2014 added Garmin Communicator (thanks CraigW)

  • jgermann - May 3, 2014
    5/3/2014 added comments to POI Loader

  • jgermann - May 2, 2014
    5/2/2014 added recalculating

  • jgermann - Apr 30, 2014
    4/30/2014 added myTrends and traffic Trends

  • jgermann - Apr 30, 2014
    4/30/2104 added addressing types logical and point

  • jgermann - Apr 29, 2014
    4/29/2014 added myTrends

  • jgermann - Apr 28, 2014
    4/28/2014 added Lane Assist

  • jgermann - Apr 24, 2014
    4/24/2014 updated MTP devices

  • jgermann - Apr 22, 2014
    4/22/2014 added UIStats.log

  • jgermann - Apr 20, 2014
    2/20/2104 added ASR speech recognition files

  • jgermann - Apr 19, 2014
    4/19/2014 added MapFactor

  • jgermann - Mar 31, 2014
    3/31/2014 added Garmin Real Directions and Real Voice

  • jgermann - Mar 31, 2014
    3/31/2014 added TTS3

  • jgermann - Feb 6, 2014
    2/6/2014 added link to large JCV file

  • jgermann - Jan 29, 2014
    1/29/2014 Added info on EPE loading unix .gpx files.

  • jgermann - Jan 20, 2014
    1/20/2014 added TourGuide

  • jgermann - Jan 10, 2014
    1/10/2014 added GUPDATE.GCD

  • jgermann - Jan 9, 2014
    1/9/2014 added Garmin Cure3, RGN Tool and symbol extractor links

  • jgermann - Jan 6, 2014
    1/6/2014 added size of 2014.3 large JVC file

  • jgermann - Jan 4, 2014
    1/4/2014 added Mass Storage

  • jgermann - Jan 4, 2014
    1/4/2014 Added Recently Found

  • jgermann - Dec 19, 2013
    12/19/2013 added info on poi-factory built in speed alerts

  • jgermann - Nov 29, 2013
    11/29/2013 Info on FAT32

  • jgermann - Nov 17, 2013
    11/17/2013 linked to Display Icons solutions

  • jgermann - Nov 14, 2013
    11/14/2013 Updated BMP specs

  • jgermann - Nov 10, 2013
    11/10/2013 update Favorites "as the crow flies"

  • jgermann - Nov 9, 2013
    11/9/2013 added info on clearing trip log on newer models

  • jgermann - Nov 1, 2013
    11/01/2013 Added Link to state Windshield laws

  • jgermann - Nov 1, 2013

  • jgermann - Nov 1, 2013

  • jgermann - Oct 28, 2013
    10/28/2013 added link to Charlie's FAQ on MTP/MS

  • jgermann - Oct 5, 2013
    10/5/2013 added info from canuk on selling unit with Lifetime maps

  • jgermann - Sep 25, 2013
    9/25/2013 Added info on "GO" button missing

  • jgermann - Sep 20, 2013
    09/20/2013 referenced test wav file and added link to alerts.

  • jgermann - Sep 19, 2013
    9/19/2013 Info on speed cameras in Canada

  • jgermann - Sep 11, 2013
    9/11/2013 added link to latest City Navigator

  • jgermann - Sep 10, 2013
    9/10/2013 added an example of KML

  • jgermann - Sep 10, 2013
    9/10/2013 info on downgrading Firmware

  • jgermann - Sep 2, 2013
    9/2/2013 Added link to TomTom POI Editor

  • jgermann - Sep 2, 2013
    9/2/2013 added comment to .wav

  • jgermann - Aug 31, 2013
    8/31/2013 added comments on search problems involving multiple maps on unit

  • jgermann - Aug 28, 2013
    8/28/2013 adding maps to nuvi itself

  • jgermann - Aug 24, 2013
    8/24/2013 Added FM Traffic reset procedure

  • jgermann - Aug 20, 2013
    8/20/2013 added Layers

  • jgermann - Jun 22, 2013
    6/22/2013 added comments to current.gpx

  • jgermann - Jun 21, 2013
    6/21/2013 added Theme

  • jgermann - Jun 18, 2013
    6/18/2013 added link to autoruns

  • jgermann - Jun 17, 2013
    6/17/2013 added gmapdem

  • jgermann - Jun 15, 2013
    6/15/2013 added link to MapInstall

  • jgermann - Jun 15, 2013
    06/15.2013 Updates to MTP, minor formatting changes

  • jgermann - Jun 12, 2013
    6/12/2013 added One Shot

  • jgermann - Jun 7, 2013
    6/7/2013 added another way to turn off MTP

  • jgermann - Jun 3, 2013
    6/3/2013 add Demo Mode

  • jgermann - Jun 1, 2013
    6/1/2013 added Shortcut

  • jgermann - May 27, 2013
    5/27/2013 corrected/updated info on maps

  • jgermann - May 25, 2013
    5/25/2013 added Garmin Model Dates (alandb)

  • jgermann - May 24, 2013
    5/24/2013 added link for getting coordinates

  • jgermann - May 24, 2013
    5/24/2013 Added Open Street Maps

  • jgermann - May 23, 2013
    5/22/2013 Info on Satellites

  • jgermann - May 23, 2013
    5/23/2013 Added map names and locales.xml

  • jgermann - May 18, 2013
    5/18/2013 - added definitions from T923347

  • jgermann - May 11, 2013
    5/11/2013 update model list and provide links to models

  • jgermann - May 2, 2013
    5/2/2013 Added link to Garmin Mapping Software

  • jgermann - Apr 29, 2013
    4/29/2013 added more MTP devices

  • jgermann - Apr 28, 2013
    4/28/2013 Added Trip Log

  • jgermann - Apr 16, 2013
    4/16/2013 Added Abbreviation

  • jgermann - Apr 10, 2013
    4/10/2013 added units that show split screen JV

  • jgermann - Apr 1, 2013
    4/1/2013 Added link to SoundConverter for Mac users

  • jgermann - Mar 29, 2013
    3/29/2013 added abbreviation

  • jgermann - Mar 21, 2013
    3/21/2013 Added links to utilities by VersatileGuy

  • jgermann - Mar 21, 2013
    3/21/2013 Added link to MapUpdater

  • jgermann - Mar 19, 2013
    3/19/2013 - minor updates

  • jgermann - Mar 18, 2013
    3/18/2013 Added max SD size for Garmin

  • jgermann - Mar 3, 2013
    3/3/2013 added method to change from MTP mode

  • jgermann - Feb 20, 2013
    2/20/2013 Added Garmin Locate and position.gpx

  • jgermann - Feb 6, 2013
    2/6/2013 added some abbreviations from DorkusNimrod

  • jgermann - Jan 31, 2013
    01/31/2013 added GPXClean online CLI command formatter

  • jgermann - Jan 29, 2013
    01/29/13 added reference to GPXClean by Camerabob

  • jgermann - Jan 28, 2013
    10/28/2013 Added glossary item and link to Garmin Express

  • jgermann - Oct 7, 2012
    10/7/2012 Added Nuvi

  • jgermann - Oct 3, 2012
    10/3/2012 Added Link to Basecamp

  • jgermann - Oct 2, 2012
    10/02/2012 Added explanation of cvs and gpx from a Frovingslosh post

  • jgermann - Sep 24, 2012
    9/24/2012 added a few terms

  • jgermann - Sep 22, 2012
    9/22/2012 Added link to Notepad++

  • jgermann - Sep 11, 2012
    9/11/2012 Expanded on Waypoint as Streetpilots use this term like Nuvis use favorites