Garmin, in turn, codes the information so that it's compatible with specific devices and offers it to customers in the form of map updates.

Garmin Express and Garmin Map Updater include methods for installing maps to a SD card for most but not all devices.For all devices there are advantages to using the cloning method.These include: Once you have tested the new map and are satisfied that everything is OK, you should delete the file \Garmin\Garmin from the SD card.Some versions of Garmin Map Updater incorrectly delete this file or download it with an incorrect name.You may need to manually restore or rename the file after the map update.