Naming Map Images in GMPC
@Dustbite
You can have 4 map images in your GarminMobilePC folder and you name them depending on which Version you have:
in v5.00.60 and earlier:
gmapbmap.img (Base Map)
gmapprom.img (detail map)
gmapsupp.img (detail map)
gmapsup2.img (detail map)
In v5.00.70:
gmapbmap.img (Base Map)
gmapprom.img (detail map)
gmapprom1.img (detail map)
gmapsupp.img (detail map)
v5.00.60 & earlier won't recognize gmapprom1 and v5.00.70 won't recognize gmapsup2, but either way you can have 3 detail maps plus the base map. Forget the "card" stuff, I think that's just a translation glitch, they're all just map images.
If you want even more maps, you can of course combine them with Mapsource up to the 2Gb image size limit and then have up to 6Gb of detail maps, or just keep in your gmpc folder additional maps coveniently named (nth_amer.img for example) and rename to a legitimate .img when needed.
EDIT: See Post #46 by syzygy for info on adding an extra map to version5.00.70 (gmapsup2.img) using hex edit. Be sure you're competent with a hex editor and heed syzygy's backup & user's own risk warnings. Thanks syzygy ;)