Thread: CityXplorer maps unlocked to work in Nuvis 37xx series

Since all special versions of cityXplorer for nüvi 3790 have FID = 800 & PID = 1 you will only need one (1) unlock code for all of them. It seems not to be a widely spread knowledge that the "gmapsupp.unl" file can hold all unlock codes in a Garmin GPS unit. If one needs 100 unlock codes for some reason then all can be put inside "gmapsupp.unl".
Just as an example - If you have a memory card with Garmin Language Guide and 5 of the special cityXplorer maps, you just need one 25 character code for the language guide and one 25 character code for the 5 CX maps. All 2*25 = 50 characters written inside the "[Memory Card]:\Garmin\gmapsupp.unl" file as a consecutive string without delimiters or carriage return / line feed. The "gmapsupp.unl" file should be a multiple of 25 bytes (25, 50, 75 ... etc.).

If you don't put the unlock code in the "gmapsupp.unl" file then you have to make one UNL-file for each CX map or embed the unlock code inside the <CX>.img file. It would be easier to just use one unlock code and administrate that in the "gmapsupp.unl" file. This would allow adding more of the special CX maps to the Map directory without any extra copying of UNL data and/or UNL-files.
CX maps should be in the "Map" directory, either on the memory card or in the Garmin unit. The best source to find where a file belongs is to look inside "[GPS unit]:\Garmin\GarminDevice.xml".

This is the "GarminDevice.xml" part for CX maps and how it finds MMR data inside a CX img file.

Code:

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Here's just some example pictures with cityXplorer Melbourne (Sensis). It works great to simulate even when you're in Europe.


If you're not in the cityXplorer coverage area - Set the unit to GP simulation mode:


If you're not in the cityXplorer coverage area - Use the "Where To?" ...:


... and set a current location (simulated position):


Use the "Where To?" and choose a end point for your route. Then choose "Public Transit" for the route calculation:


As a result where should be a route with public transportation data:

Originally Posted by Ballebar

Since all special versions of cityXplorer for nüvi 3790 have FID = 800 & PID = 1 you will only need one (1) unlock code for all of them. It seems not to be a widely spread knowledge that the "gmapsupp.unl" file can hold all unlock codes in a Garmin GPS unit. If one needs 100 unlock codes for some reason then all can be put inside "gmapsupp.unl".

Great tip! I did exactly the same, but I also went to the extreme to add a comment for each unlock code. Here is what my gmapsupp.unl looks like.

Code:

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Each line starts with 25 characters of unlock code, followed by 23 characters of comments, then followed by a DOS end-of-line (i.e. carriage return + line feed). This format is designed for DOS editors. If you use Unix editors, you can have 24 characters of comments followed by a Unix end-of-line (i.e. line feed only). Or if you use Mac editors, you can have 24 characters of comments followed by a Mac end-of-line (i.e carriage return only).

You can have anything in the comments. I just put MapID and map name. The MapID makes it easy to create a new unlock code for another device without looking up the MapID again. Of course, if 23 characters are not enough for your comments, you can use 23+25, 23+50, ... (in general 23+25*n) characters for comments too. All space of the comments must be filled in. For example, I appended dots to the end of the first line to make the comments 25+23 characters long.

Since each unlock code is in one line, it becomes very easy to add, move and remove unlock codes. If all unlock codes were in one long string instead, it would be very difficult to find where the 50th unlock code starts and ends to remove it.

Originally Posted by wombat772

So suggestions welcome.

I had the same problem of not showing EPM until I shut down my device (long pressing the power button) then powered on to reboot and reload the maps again. You may want to give it a try.

yep tried that a few times no help although it did get the maps workingafter installing but not the EPM