But according to this wonderful web page, it also works for some other brands.
I navigated to my /home directory and created a new folder named “Garmin Nuvi.” It has a subfolder called Maps. Copy it back to your Garmin, re-start it, and take it for a test drive.
Move these additional files back to the device's internal storage, replacing the original files and preserving the folder structure as downloaded to the card.
Once you have moved these files back to the device, the .system folder on the SD card will be empty and should be deleted.
You may need to manually restore or rename the file after the map update.
I’m just going to write about the Garmin GPS because that’s what I have and all I really know.
The technique I’ll show you here uses Open Street Map, a free and open-source collaborative work.
Maps are updated much more often than the official Garmin maps.
I do the Fed Ex Ground delivery driver thing, and I have an old hand-me-down Garmin Nuvi that I use on my route.
Not for directions, but just as a “rolling map” to tell me where I am and streets are coming up as I travel.