Junction View Discussion for Garmin's City Navigator NA maps

 

This is the discussion thread for questions, comments, suggestions, etc. for the following FAQs:

http://www.poi-factory.com/node/45291

http://www.poi-factory.com/node/45292

Index

has been updated

Thanks CraigW.

In addition to the nuvi 7x5 series, the full coverage (large) JCV file is also still received with the map update on the zumo 6xx (660 and 665). AFAIK, these are the only devices that currently get the full screen full coverage JCV with a map update.

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Thanks

alandb wrote:

In addition to the nuvi 7x5 series, the full coverage (large) JCV file is also still received with the map update on the zumo 6xx (660 and 665). AFAIK, these are the only devices that currently get the full screen full coverage JCV with a map update.

Thanks, additions have been made.

And thanks, jgermann, for the super-quick Index update.

question re 765

I just updated my 1490 and 765 to 2016-2
the 1490 has a large jcv file in the jcv folder but the 765 only has 2 old sum files.
I thought it was said that the file is automatic with the update to a 765 -- and that the 1490 was manual.
Is it the other way around??
I actually have no jcv file on the 765.
but I think it still shows JVs - it is my wife's so it may not.

Should I just copy the 1490 JCV folder to the 765??

765T

You should have received the large JCV on the 765T. If you did not, it could be because of a space issue. Are you using a SD card for the map install? If not, you may need one. Did you use Garmin Express or Map Updater? Are you installing the full NA map or a reduced region? Depending on the region selected, you may not get a JCV file at all for reduced regions. I think you will get a JCV file for Full NA, Lower 49 and Lower 49 plus Canada. Anything smaller than that, you probably won't get a JCV.

Your 1490 wil get a JCV file, but it will be a puny (25 MB) file that does not have full coverage or photo realistic images. However, if you get the problem resolved with your 765 map update, you can copy the full coverage JCV file from your 765 over to the 1490. You will definitely need a SD card in the 1490 to get the full NA map and large JCV

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Check Your Setup Log File

I've learned quite a bit in the past month or so, but am still climbing the learning curve on Garmin Express logging during map updates, so can't point you to a specific file name, but there are two levels of logging (one more verbose than the other) that should provide some clues if you used GE to do the update.

As for GarminMapUpdater, there is a very specific area in SetupLog.txt (after the unlock codes verifications but before downloading begins) that describes which of a handful of JCV files are provided with each map update's Region. Most threads here talk about the full North American map download and its JCV file relevant to your GPS's model, but there are others specific to each of the smaller regions and they're all named in the log, regardless of the region chosen for your update. A few of the smaller regions share the same JCV file.

By searching further into the log, you should be able to find entries describing the download (or failure and re-queue) and probably an MD5 verification, etc.

Also, failure to run a map update under an Admin (or equivalent) UserID can result in issues because Windows permissions allotted to a "regular user" prevent some files from getting stored where the chosen update utility expects to be able to write.

Nuvi 755T

one of my daughters gave me this GPS that she no longer uses. It's in good shape. Will it support "junction view" and if so, how do I get the necessary on it?? It does have a 16GB SD card installed.

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Ed - Garmin Zumo 550 (have 2)

Good news

Ed Y wrote:

Nuvi 755T

one of my daughters gave me this GPS that she no longer uses. It's in good shape. Will it support "junction view" and if so, how do I get the necessary on it?? It does have a 16GB SD card installed.

Yes, the nuvi 755T supports Junction View. If you create and drive or simulate a route involving interstate highway junctions and exit ramps, you should see a large full-screen junction view for several seconds before reaching junctions and ramps.

Does the device have lifetime updates? If so, when you start the latest map update, be sure to watch for the offer to install all of North America to a SD card if it states that your device has too little internal storage for all of North America. At the end of the map update, you will have the current (2016.20 North America) map update and the correct Large JCV file offering Junction Views. If you do not have lifetime map updates on the device and you plan not to buy it, then tell us what map version you currently have. Tap Tools/Settings/Map/MapInfo for this information.

Couple of points about the nuvi 755T.

Garmin never sold the 755T in a configuration that included a lifetime map subscription. So, unless a subscription was purchased separately, it would not have a map update subscription. It is possible however that if the nuvi was never registered, it might be still be elgible for the one-time nuMaps update guarantee ... probably not, but worth a try. I would probably not invest in a lifetime subscription for this device because of its age and the fact you can get a new Essentials series Garmin with lifetime maps for a few dollars more than the cost of the subscription.

The full NA map with full coverage JCV file will fit in internal memory with about 100 MB to spare for free space, but ONLY IF you do a good job of deleting unnecessary voice, text, help files for unused languages. It is easier however, to just add a SD card, and let Garmin Express use that for the map update.

In spite of its age, the 755T is still a great GPS with lots of advanced features. The only thing I don't like with my 755T is that the screen is not very bright and is hard to see in bright daylight conditions. It has been this way since the day it was new.

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

thanks for the info

The device had the original 2009 map on it. No lifetime maps with it. Due to it's age, I just got a one time upgrade to 2016.20. This unit is for the wife's car and she's not too particular about map updates. 1st time using Garmin Express. I've always used Mapupdater and mapinstall to put maps on both the Zumo 550's I've got. BUT Garmin Express worked just fine. I got the latest map on the units SD card and also installed to computer. I did find the .jcv file so next time I'm on an interstate (none close to where I live), I'll check it out.

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Ed - Garmin Zumo 550 (have 2)

Fantastic!

Ed Y wrote:

The device had the original 2009 map on it. No lifetime maps with it. Due to it's age, I just got a one time upgrade to 2016.20. This unit is for the wife's car and she's not too particular about map updates. 1st time using Garmin Express. I've always used Mapupdater and mapinstall to put maps on both the Zumo 550's I've got. BUT Garmin Express worked just fine. I got the latest map on the units SD card and also installed to computer. I did find the .jcv file so next time I'm on an interstate (none close to where I live), I'll check it out.

What great news!

For future reference, when updating a device map with MapInstall using a map on your computer, you will be able to update the map file, but all other features of the device (Junction View, Voice Recognition, etc.) will not be updated. So for the 765 if you ever buy another update for it—or if you buy a new Garmin GPS—be sure to use Garmin Express or GarminMapUpdater, and not MapInstall. Since your zumos had no extra features, MapInstall did all you needed it to do.

I expect you know this already, but your current map on the SD card means the card must always be in the nuvi to access the current map—and the map on the SD card will only work in your 765T so the map-on-SD you have will not work in any other device.

PS: Be sure to thank your daughter for never registering her GPS or updating the original 2009 map. If she did either, you'd not have been able to get the current 2016.20 free and you'd still have a six year old map. smile

Small JV file with 855

One advantage in receiving the small Junction View file is that I can still install the full NA coverage without resorting to the cloning method.
Mark

RE map updates, I bought 2

RE map updates, I bought 2 on ebay for under $50.ea.
1 for 1490 and 1 for 765T. Worth it at that price.

There is also a smaller version of the split-screen file.

CraigW,

Garmin now offers at least 4 Junction View file types (xxxxxxxx.JCV files). There are the 3 mentioned in the 45292 link provided above, plus:

4) A smaller version of the split-screen JCV file which is supplied to newer Garmin device models with limited storage space (such as the Nuvi 3760). This smaller split-screen JCV file is roughly 163MB in size.

Now that we have the ability to load files to an SD card, those of us with newer Garmin devices that have limited storage space can replace the small file Garmin provides with either the 800+MB full-screen or 400+MB split-screen file for use with our devices.

--
Garmin nüvi 3597LMTHD, 3760 LMT, & 255LMT, - "Those who wish for fairness without first protecting freedom will end up with neither freedom nor fairness." - Milton Friedman

Thanks Craig and Alan...

For your work on this. The workings of Junction View have always seemed inconsistent to me. Your findings demonstrate the way JV “should” work. There are other variables which you might consider. Among them are “Stuck” or missing JV screens which have been reported by several of our members.

Last year, both Canuk and myself noticed a stuck JV screen at approximately the same time using different GPSr’s near exit 70 on I-81 north in Harrisburg PA. I travel this route a dozen or more times a year and was never able to duplicate this issue. Since then, I have however noticed missing JV screens at this location on more than one occasion. See:

http://www.poi-factory.com/node/44602

and

http://www.poi-factory.com/node/44722

It is hard to tell if the problems are related to firmware, map update versions, local conditions, individual GPSr’s, user error or various combinations of the above.
In any case, thanks for posting the results of your tests.

Partial explanation for JCV discrepancy

CraigW, in your FAQ you state:

Quote:

To further muddy the waters, the commonly stated and reasonable assumption that with the exception of the nuvi 8x5, 1390, and 14xx series, all models offer the same (maximum) number of Junction Views is incorrect. I did a test and found that the commonly stated claim that the split screen JVC file contains the identical the number of junctions offered as the the Large JCV file offers is not correct but I don't have much information on how the number of junctions with a JCV entry varies between files. Here's the thread offering examples confirming that the typically-stated understanding of JCV files and each file's number of junctions with a "view" is not always correct. Look in the thread for my reply with the Subject While We Wait and subsequent discussion.

One possible explanation for some of these discrepancies has to do with devices that have active lane guidance. These are similar to junction views, but have animated views of the intersection with moving markers to show you which lane to be in. These active lane guidance views are not in the .JCV file, but instead are embedded in the map .IMG file (or maybe one of the .SID files). And, for intersections with Active Lane Guidance on devices that support the feature, the static junction view is not shown, even if it is in the .JCV file. To further confuse us, the Active Lane Guidance views DO NOT show when scrolling through the list of turns when browsing a route. So it can appear on these devices that they are missing some junction views when browsing through the route. But when you simulate or actually navigate, these interchanges will show the Active Lane Guidance views. One side effect of this is that as Garmin adds more Active Lane Guidance views in new map updates, it can appear when checking old routes that some Junction Views were removed when they were really just superseded by an active view.

I hope this makes sense. Rick and I discussed (and confirmed) it in another forum after the 2018.20 update.

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Thanks

alandb wrote:

CraigW, in your FAQ you state:

Quote:

To further muddy the waters,...

One possible explanation for some of these discrepancies has to do with devices that have active lane guidance...

Thanks. FAQ updated.

And ...

... for those who haven't yet experienced active lane guidance here is a GPS City video

https://www.youtube.com/watch?v=4h-ofPy4Ha4

Personally I don't like it, and would rather just have junction view, but as stated above they are embedded in the map so nothing can be done about it.

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Where there's a will ... there's a way ... DriveSmart50LMT-D, Nuvi 2508LMT-D, 1490LMT, 1310, Montana 650T, Etrex 20

Lane assist.

sussamb wrote:

... for those who haven't yet experienced active lane guidance here is a GPS City video

https://www.youtube.com/watch?v=4h-ofPy4Ha4

Personally I don't like it, and would rather just have junction view, but as stated above they are embedded in the map so nothing can be done about it.

I agree, and even more disappointing is that it seems on these newer models Garmin has removed some of the old style lane assists (small arrows in the upper left corner). To me that is the most useful and takes very little screen real estate.

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Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon

Ditto

sussamb wrote:

... for those who haven't yet experienced active lane guidance here is a GPS City video

https://www.youtube.com/watch?v=4h-ofPy4Ha4

Personally I don't like it, and would rather just have junction view, but as stated above they are embedded in the map so nothing can be done about it.

I don't like it either. All in all, I think our melaqueman summed it up best when he wrote In a set route the right split screen also shows you going on the enter ramp and it is really annoying the way it shows it, could almost could make you dizzy. It is almost as if you are hovering right above the pavement. shock