Thread: Unlocking maps in MapSource with JetMouse

@kouma
You cannot load a map in the form of a *.img file into MapSource, nor can you load one into BaseCamp or MapInstall for that matter. However, BaseCamp can see, but not work with an img file in a device or media card to complile anything further.

So you must first obtain and load map data in the form of a .GMAP folder to PC or Mac. Place the appropriate *.gmap as follows:

For Windows OS:
XP - C:\Documents and Settings\All Users\Application Data\GARMIN\Maps
Vista to 10 - C:\ProgramData\Garmin\Maps

For Mac OS:
/Library/Application Support/Garmin/Maps/

Then you can compile img files for devices or media cards. However you should not use MapSource to work with modern NT/U mapping data (this includes all City Navigators) as you will get navigation errors or worse, freezing or random reboots of the GPS. Install BaseCamp/MapInstall now days for that because MS uses a different algorithm to compile and cannot cope well with the newer forms of mapping data. BaseCamp invokes MapInstall to handle the installation when you click Maps>Install Maps or you can open MI directly without BC if you wish.