2720 Question

**Neil** · 26th January 2025, 11:01 PM

If it's a PARTIAL NA image file that's less in size than the available space on your SP then you can send it using [Only registered and activated users can see links. ] via command line: [Only registered and activated users can see links. ]. If loading to rgn49 use "gmapprom.img" naming. If rgn10 it's "gmapsupp.img".

If it's a FULL NA/Lower48 then it'll be too big to fit as I think you're correct saying that your 2720 is limited to ~1.7 GiB (that's Gibibytes i.e. binary, not Gigabytes i.e. decimal), so it should have ~1,825,360,000 Bytes probably. You can check the size of a region and dump its content using the method described in this [Only registered and activated users can see links. ].

It's also possible to send an appropriately sized IMG as an RGN file using Updater.exe, as explained [Only registered and activated users can see links. ].

Or you can use old programs like [Only registered and activated users can see links. ].

So, there are several ways to load an IMG file to your SP provided space allows but none of them are as easy as using the PC Install files/GMAP folder. That's because you can simply select map tiles up to the appropriate size and transfer using MapSource or MapInstall, but you can't load an already-compiled IMG file that way.

Note that whether using PC install or IMG transfer that the files must either be fully unlocked or you must embed a 25-character UNL code.

**Kurt Franz** · 27th January 2025, 03:59 PM

Originally Posted by Neil

............
So, there are several ways to load an IMG file to your SP provided space allows but none of them are as easy as using the PC Install files/GMAP folder. That's because you can simply select map tiles up to the appropriate size and transfer using MapSource or MapInstall, but you can't load an already-compiled IMG file that way.

Note that whether using PC install or IMG transfer that the files must either be fully unlocked or you must embed a 25-character UNL code.

Can offer any further advice on using this method? I was thinking Sendmap - and I tried working with it but was not able to create the install file to load the map into Mapsource. Or am I way off here....?

**Butters** · 28th January 2025, 12:55 AM

Yes, you are on the wrong track about SendMap. It sends an already fully compiled IMG file to a device. Read this: [Only registered and activated users can see links. ]. Basically it simply sends an IMG to the device, just as previously described for the other methods, i.e. by command line using WebUpdater, or flashed directly by Updater.exe to a region using an RGN file.

The official Garmin programs, MapSource and MapInstall, both use mapping data previously installed on your computer (i.e. from a GMAP folder/PC Install Files) to select parts (i.e. map 'tiles') from that data to be then sent as an IMG which the program compiles 'on-the-fly'.

**Kurt Franz** · 28th January 2025, 01:27 AM

Originally Posted by Butters

The official Garmin programs, MapSource and MapInstall, both use mapping data previously installed on your computer (i.e. from a GMAP folder/PC Install Files) to select parts (i.e. map 'tiles') from that data to be then sent as an IMG which the program compiles 'on-the-fly'.

This is what I am attempting to accomlish. I want to build the PC install exe file that will load my gmapsupp.img file into Mapsource in the same manner the garmin install dvd would do it - if I had it. Does that make sense? Thanks for the help

**Butters** · 28th January 2025, 11:59 AM

Originally Posted by Kurt Franz

...... I want to build the PC install exe file that will load my gmapsupp.img file into Mapsource in the same manner the garmin install dvd would do it .....

Then as Neil said in both Posts 7 & 9, you need to find a GMAP folder for the 2022.25 City Navigator. There's no EXE files used by Garmin any more, that method finished many years ago for loading install data to a PC for CN mapping.

Maybe you're still a little unsure about all this, so to be absolutely 100% clear - there's no way to directly load parts of an existing IMG file by using any official Garmin software like MapSource or MapInstall. They only use install data from the PC's ProgramData/Garmin folder, stored in a *.gmap folder.

It's not feasible, albeit technically possible, to reverse-engineer an IMG file because the result will not contain routing data so it would be useless for navigation other than as a moving-map situation to keep track of your location.

**Kurt Franz** · 28th January 2025, 03:44 PM

Originally Posted by Butters

Then as Neil said in both Posts 7 & 9, you need to find a GMAP folder for the 2022.25 City Navigator. There's no EXE files used by Garmin any more, that method finished many years ago for loading install data to a PC for CN mapping.

I understand now - I need what I looked all over for but could not find.......the Unobtanium Folder that contains

.mdx
.trf
.typ
product1 folder

etc....

I had a hard enough time finding the gmapsupp.img file looks like I am SOL trying to do it the way I tried.
thanks for your help fellas.

**Neil** · 28th January 2025, 09:59 PM

I still think your initial idea of loading OSM mapping is the best and easiest solution. The OSM link is in Post #9, just follow the download guide.

If you are absolutely determined to load a partial NA from a GMAP folder then look for "City_Navigator_North_America_NT_2022_25.gmap" (it looks like a file name but it's a folder). The size is getting up near 4.5 GiB so not many, if any, download links would still be active after 4 years. If you really, REALLY want it then send me a PM and I'll help you find the folder, but it'll be more like just shoving you in the right direction and not actively assisting with the actual loading process.

**Kurt Franz** · 29th January 2025, 10:37 PM

Have it figured out and functioning.

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