When you first buy a unit, the then current map is indeed stored on the unit when the image is flashed at the factory. We then suggest you make a complete Explorer, not Home, backup of its contents. As a safety net. When you upgrade the map, it first gets installed on your computer in compressed form here: C: Documents and Settings yourname My Documents TomTom HOME Downloads complete maps The Home installation process then attempts to overwrite the existing map with the contents of the newer (such as 845) map. Sometimes, things go wrong and you are left with a partial install and no apparent maps at all (which is why the backup is made.) Also, sometimes in the process, Home will inform you there isn't enough space (when there is) and tells you to start deleting some files on your unit to make the new install fit. Or, it has been known that the vital.meta.dct file never got extracted by Home from the compressed file and so the new map doesn't get activated. Bottom line is many don't even use Home for the map install. A way to do that is here. ![]() ![]() Global leader in navigation, traffic and map products, GPS Sport Watches and fleet management solutions. ![]()
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