I posted in another thread.
for those with GPS dongle OTHER than garmin, you have to enter activation code that came on the inside of the box. it will need internet connection to do the activation. once activated, it will work with bluetooth, usb or serial USB.
for those who already own Garmin GPSr, you don't need to do activation. in fact, you can just download the update and install and viola.
as for adding other map, as i post in another thread,
http://www.mp3car.com/vbulletin/gps/...ml#post1208770
it function just like Garmin Mobile XT. Ie it use the gmapsupp.img, gmapprom.img and gmapbmap.img format.
which also means it uses the same unlock code system. ie gmapsupp.unl, gmapprom.unl and etc.
you can generate this from mapsource. in fact, mapsource seemed to detect the installation but i had trouble exporting the map to GMPC.