Having Garmin zumo XT problems? there is loads of help and advice in this forum
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While adding Open Street Maps to my XT’s sd card I ran across this: I added a 3.9 gb topo map directly to the SD card as gmapsupp.img but found it too slow to refresh on the XT. Rather than deleting it, I thought to ‘deactivate’ the map by renaming it OSMTopo_gmapsupp.img and loaded a smaller OSM map as gmapsupp.img. Checking MyMaps on the device showed both OSM maps available. The XT recognized OSMTopo_gmapsupp.img as a valid map name.
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