Thread: Nuvi 3790T incorrect behavior

Originally Posted by Cmagalha

Then I have the CN North America (original) map in the internal memory and 3 brazilian maps into .MAP folder onto the microSD card.

These are packed as ONE gmapsupp.img file. The GPS shows them as three separated maps anyway (City Navigator, Autoguia, Tracksource).

The first problem is that:
When I turn on the 3790, all 3 maps are selected.
Then I go to the proper screen and de-select 2 of them, leaving just one.
After a few minutes ( 15 - 20 ) the GPS shows a monocolor background. I check there are NO maps selected.
Or sometimes all 3 are selected again.

I am guessing a firmware problem ?.

Yes, it's a new firmware "feature-problem" for 37xx (and with all firmwares for 34xx-35xx)
3790 no longer allows to check seperatelly any maps that are in a "mapset" like yours (3 maps in 1 file).
You must check ALL of them or NONE of them.
This is a problem since some companies produce a map (1 file) which inside has 2 sub-maps.
For example a Topo map which inside has 1 "solid" map with all the info and one "transparent" with only the land contours.

If you have your 3 maps in seperate files, just copy the 3 of them (using any names you like but with extension .img) on your microSDcard.
If you only have them as 1 file, then you have to install [Only registered and activated users can see links. ] and [Only registered and activated users can see links. ]
In gmaptool "OPTIONS" write the location of cGPSmapper.exe
Load your 1 file on gmaptool, choose "SPLIT", choose "CREATE:mapsets by FID", press "SPLIT ALL" and you will have your 1 file splitted in 3 files.

With all new Garmin devices you don't need to use such mapset files (2in1, 3in1, 4in1 etc), because you can write as many seperate map files as you like in MAP folder (on internal memory or microSDcard)


If you don't have any Brazilian TTS voice on 3790, use Garmin's [Only registered and activated users can see links. ] program and proceed to "additional updates" and check and download "Brazilian-Portuguese Raquel TTS" voice.