Thread: About Garmin maps Additions files (gmap3d-JCV-gmaptz-ASR-G2S)

Great info.!!!!
Based on this, I made another discovery!
If not using gmap3d.img and gmap3d1.img on the device, you can instead use those filenames for other map img files in the "Garmin" directory of an SD card!!!
I can now can have 3 map .img files always available on my SD card (gmapsupp.img, gmap3d.img and gmap3d1.img).
You can use MapSource Special to create & transfer gmapsupp.img files directly to the SD card that contain several maps (each img file just less than the 4gb limit).
After the first transfer completes, rename it to gmap3d.img.
After the second transfer completes, rename it to gmap3d1.img.
After the last gmapsupp.img transfer completes, move all the created map img files to the "Garmin" directory of the SD card.
If you have a 16gb SD card, the result can be that you have almost 12gb of additional maps always available for the device to choose from.

Tested on my nuvi 775T.

This would be amazing. Have to test this also, use the 765

Originally Posted by Danilone19

Sorry, errata "but if I rename gmapbmap.sum"
corrige "but if I rename gmapbmap.img"
Thank you

The terrain shading u see is propably from the DEM Basemap, not fro the MD2 file.
MD2 files are normally placed in Garmin\MD2

Catymag, I know that you've asked to avoid Thank You posts - but this being the clearest tutorial on the subject ever, I could not resist... ThankYou!

Great info!

Got me a bit confused though, I have a Nuvi 3790T with built in North America maps, and I plan to install the 2011 Europe and 2011 Middle East maps, but I see some people around the forum saying that maps have 2 versions, a MapSource version and a regular version, according to some posts, the regular version will lose the map preview and some search/index capabilities, how true is this?

Since I'll be using the JCV and 3D files, does the latest MapSource support Lane Assist and Junction View files? Or am I going to have to move those manually to the device?

One last thing, after looking through my device, the following files "gmapbmap, gmapdem, gmaptz, gmapprom, gmap3d, gmap3d.sum, gmapbmap.sum, gmapdem.sum, gmaptz.sum, gmapprom.sum" are located in a hidden folder "F:\.System". I assume that in the case I use Map Source to install the maps, it will take care of putting them in the right location, but what if I had to move the maps manually, should I put them in the same hidden folder "F:\.System" or should I just go with the Garmin folder? Please let me know if I'll be losing the Map Preview and Searching if I move an unlocked map manually.

Thanks a lot in advance, really appreciate the help I'm getting.