Based from the info of catymag in one of the links posted above:
diagnostic utility first page displays internal memory maps
Nuvi internal (diagnostic utility) OS map naming
1. PROM1 = gmapprom.img
2. PROM2 = gmapprom1.img
3. Suppmap1 = gmapsupp.img (nuvi drive only)
4. Suppmap = gmapsupp.img (SD Card drive only)
5. Dir DB = gmapoem.img (OEM POI data map)
6. Basemap = gmapbmap.img
7. TZMap = gmaptz.img
8. 3DMap 1 = gmap3d.img
9. 3DMap 2 = gmap3d1.img
sd maps should be in second page
***I'm not sure if I understand it correctly but I think my case falls under "3. Suppmap1 = gmapsupp.img (nuvi drive only)" and "suppm..." means Suppmap1 which is just right because I stored my gmapsupp.img in NUVI DEVICE and not in SD card. I hope I got it correctly.
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