Currently there is no SD card in the slot. All the map is in the head unit memory. I am able to plug my laptop to the unit via USB and access the map file which has a file about 1GB in size called "gmapprom" and also another file thats about 100MB called "gmapbmap"
Do you think I can just delete and place new map? I cant add because there is not enough storage space on the internal drive (think there is about 2GB total). If I put it on a SD card do I just copy paste?