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SD Card with preinstalled maps of the world + Terrain of the world preinstalled on the unit
Maps and elevation files are preinstalled with AIR³. However, as RoadMaps are large files, AIR³ is provided with a limited set of maps. Additionaly, you may be willing to keep enough free space for your favorite android apps. You can free up memory by removing some pre-installed maps. You can use a SD card to extend the memory capacity.