@ stealthr
I only asked where you had GarminMobilePC installed, i didn't ask about where the the gmap folder's installed. I think you're quite confused about all this, obviously. The detail map image which is used by GMPC is a compiled working map and is not to be confused with the files contained in the gmap folder which are used to compile that resultant image file map.

Usually, the program Garmin Mobile PC is installed in the root of the computer's C drive [i.e. the system drive/partition], but it can be installed to another internal partition or separate internal drive or an external drive which is why i asked the question. In the old post quoted above, the user michaelzeus has it installed in E drive. Regardless of where it's located, if you don't have a basemap in the GarminMobilePC folder it cannot function for navigation at all if there's also no detail map present. Both are needed for trouble-free complete navigation.

Your MapInstall can see your C drive, so just send your detail map selection to the root of C drive [which you've said is the only install option it's offering], then move the resulting gmapsupp.img to the GarminMobilePC folder as i said in post #171 above. If you have no gmapbmap.img file in there, get one from here: [Only registered and activated users can see links. ].