Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Some models of Proton Preve have a Garmin GPS with the Blaupunkt HU device. So what you would need in that case, is a Garmin map update.
This should be a Blaupunkt HU with a micro-SD card slot in it.
You do a map file manipulation after obtaining the map file, on a PC-type computer.
The way it all goes in point of detail is:
1 - go to www.malfreemaps.com and sign up there, then obtain a Garmin map update for the Blaupunkt there.
2 - download a Gamin map update there, execute it according to their instructions, then
3 - file "gmapsupp.img" will be created in the "c:\Garmin\Malfreemaps" folder. Copy that file into your microSD card, into the "Garmin" folder on it.
4 - rename the 2 existing files "gmapprom.img" and gmapprom1.img" on the MicroSD card to "gmapprom.old" and "gmapprom1.old". Rename the copied file "gmapsupp.img" to "gmapprom.img".
5 - put the microSD card into the Blaupunkt HU's card slot, and turn On the Garmin GPS function, so that it will update from the microSD card.