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Backroadmapbooks uses Garmin License technology to unlock and display the maps on your unit.

The license files are used to unlock the maps on your device and can also be used to unlock the maps you have installed in Garmin Basecamp.


Screenshot_2021-01-20 Print - gps-updater-instructions-mac-2020 pdf


Backroadmapbooks MicroSD card will contain the following files in the Garmin folder:


The POI folder will contain the Points of interest data stored in a .gpi file.


The gmapsupp.img file is the map data for your province.

The .gma file is used to authenticate the maps on a GPS when loaded from a microSD card.

Garmin Basecamp requires you import this .gma file to authenticate the installed maps before they will display a fully detailed map.

The .unl file is the unlock key file and consists of your 25 digit key.

License files are located in the Garmin folder on the microSD card and are unique to each card.

** The contents of the microSD card cannot be copied to another microSD card