Thread: Naming Map Images in GMPC and GMXT

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)
[same above naming is applicable to GarminMobileXT]

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.

If you want even more maps, you can of course combine them with MapSource or MapInstall up to the 2GiB-1byte image size limit and then have almost 6GiB of detail maps, or just keep in your GMPC folder additional maps conveniently named (nth_amer.img for example) and rename to a legitimate .img when needed.

If you are confident using a hex editor, you may try adding a fourth detail map (gmapsup2.img) in GMPC v5.00.70, thanks to syzygy. See Post #46 here: [Only registered and activated users can see links. ] but take note of syzygy's recommendation to backup your que.exe and the "use at own risk" disclaimer.