I found some details on the way Garmin names map files. This may help folks who are trying to fit new, larger map sets on older NUVIs or when creating map sets with a variety of maps.
Garmin File Names
Understanding the file naming conventions used by Garmin is very useful if you intend to use multiple supplemental maps on your device. A supplemental map is basically any map other than the factory installed maps.
This is the most comprehensive list of acceptable map names I can find. This should work on most Nuvi’s.
* Note that this guide was written specifically for the Nuvi 7x0/7x5 series but may also work on other Nuvi units as well as other non-Nuvi units such as the Colorado, Oregon and other Garmin hand-helds that have a disk-based file system.
You can have various mapsets loaded on your Nuvi...not just the basemap and detail map. These mapsets all reside in the x:/Garmin folder on both the Nuvi drive and the SD Card drive. The Nuvi 7x0 can access up to six different mapsets (*one* on the SD Card). The Nuvi 7x5 can access up to nine different mapsets (*one* on the SD Card)
Mapset 1. City Navigator North America NT 2011 = Nuvi drive main detail mapset (gmapprom.img)
Mapset 2. City Navigator Europe NT 2011 = Nuvi drive OEM detailed mapset (gmapoem.img)
Mapset 3. US Topo 2008 = Nuvi drive supplemental detailed mapset (gmapsupp.img)
Mapset 4. City Navigator India NT 2009 = SD Card drive supplemental mapset (gmapsupp.img)
Mapset 5. Nuvi drive Basemap (gmapbmap.img)
*Note: Before fiddling with mapsets, make a backup of them first, especially gmapprom.img as this is your main detailed mapset.
Here's a list of the Nuvi 7x0 & 7x5's mapset names & their relationship with the Nuvi
Nuvi map naming convention
1. gmapprom.img: (7x0/7x5) Nuvi drive only, (primary mapset, factory installed USA or Europe or other country.)
2. gmapprom1.img: (7x0/7x5) Nuvi drive only (secondary mapset) example: North American / European units
3. gmapsupp.img: (7x0/7x5) Nuvi drive (supplemental mapset)
4. gmapsupp.img: (7x0/7x5) Nuvi SD Card drive (supplemental mapset)
5. gmapoem.img: (7x0/7x5) Nuvi drive only (OEM mapset), user accessible, cannot be unselected from the unit via Tools/Settings/Map/Map Info
*Note, when using the following default system maps as user maps, you'll naturally lose their default map attributes.
6. gmapbmap.img: (7x0/7x5) Nuvi drive only (default basemap), configurable as a supplemental map; rename desired mapset to gmapbmap.img, NOT selectable and does NOT show up under installed maps (Tools/Settings/Map/Map Info) but may be visible under Tools/Settings/System/About/Basemap
7. gmaptz.img: (7x5 only) Nuvi drive only (default 7x5 Timezone map), configurable as a supplemental map; rename desired mapset to gmaptz.img
8. gmap3d.img: (7x5 only) Nuvi drive only (default 7x5 3D Buildings map), configurable as a supplemental map; rename desired mapset to gmap3d.img
9. gmap3d1.img (7x5 only) Nuvi drive only (secondary 7x5 3D Buildings map), configurable as a supplemental map; rename desired mapset to gmap3d1.img
Nuvi internal (diagnostic utility) OS map naming
1. PROM1 = gmapprom.img
2. PROM2 = gmapprom1.img
3. Suppmap1 = gmapsupp.img (Nuvi drive only)
4. Suppmap = gmapsupp.img (SD Card drive only)
5. Dir DB = gmapoem.img
6. Basemap = gmapbmap.img
7. TZMap = gmaptz.img
8. 3DMap 1 = gmap3d.img
9. 3DMap 2 = gmap3d1.img
Please give credit to the poster & forum where you lifted this post from.
Gee, that sounds a lot like something I wrote up...I'll bet my write-up is floating around all over the net.
and here: http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=120770
As I looked at these identical entries, it seems that DorkusNimrod posted in a thread on December 15, 2008 @ 7:09 pm on this site (with an update on 12/18/2008) DorkusNimrod has "nuvi 750, nuvi 760, nuvi 765T, nuvi 855, nuvi 3790T - SoCal area"
On the gpsreview site the identical guide was posted by SergZak on Mon Dec 15, 2008 11:30 pm and then updated 12/18/2008. at the bottom of the post there is the annotation "Last edited by SergZak on Wed Sep 01, 2010 5:46 pm; edited 5 times in total"
On the gpspassion site, the guide was "Posted - 16 déc. 2008 : 00:16:26" by SergZak with an annotation "Edited by - SergZak on 12 févr. 2009 14:44:47 " SergZak has "nüvi 3790T, nüvi 765T, nüvi 855, nüvi 760, nüvi 750"
I noticed that z3bum said
so I would suspect that he found this on one of the other sites (otherwise perhaps he would have pointed to the thread on this site)
z3bum, thanks for posting this as I have a 765T and I have cut and pasted the information into the info I keep that might help me use my 765T better. Had I found this on another site and posted it on this site to give information, I do not know whether or not I would have cited the author and/or the other site.
Since this is really good information for those of us who like to dig deeper into the internals, I hope that it will be updated for other Nuvis - on the assumption that it is different. Since I only have a single unit (my 765T) I would not know how to do this. However, with the advent of "lmt", I might decide to get another unit as the "lmt" seems cheaper in the long run than my getting lifetime updates on my current unit.
FYI: DorkusNimrod=SergZak...I am DorkusNimrod on this site and SergZak on gpspassion & GPS Review.
And to note, newer nuvis starting with the 1xxx series don't have the earlier nuvi mapset name restrictions as noted in the write-up. You can now name your valid mapset to anyname.img (the .img extension must remain) and put it into the Map (NOT Maps) folder in the root of the nuvi drive. If the Map folder is not there, you can create it yourself.
I was fairly certain that was the case.
As I often do, I am going to suggest that you make a FAQ of this guide - along with the "edit" note just mentioned. While threads are often a good way to get other's feedback for something that might be a FAQ, they should be then turned into a FAQ because most look there to answer their questions.
Maybe a name like "Naming supplemental maps" or "How to name supplemental maps"
Thanks for doing this guide. I found it very informative.
'MapSelect' is nice program that allows you to have multiple maps on your Garmin device or on your storage card.
The number of valid maps is determined by your Garmin, so you can't use more maps simultaneously, but it allows you to easily select from a number of maps on your device or storage card.
As a bonus, the program can edit the map name embedded in the file!
The .rar file contains the program plus a document with detailed description how to use it....
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