I just purchased my nuvi 3790T in the United States and got it into Brasil.

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 ?

The second problem is that:
When approaching a turn, the GPS says: turn right in 100 meters
It DOES NOT say: turn rigth in 100 meters on Yellow Avenue

Part of the message is missing.

Does anyone has seen this ?

Thanks for any help guys !
.