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Hi do you still have the software that came with the gps as it sounds like their is corrupt data on the gps. You will need to reinstall all software and load up all the maps that you need. Let me know how you get on ok
Units that provide fullmapping capability cannot use the standard file formats used by thedigital map publishers for on-screen mapping and instead use in-builtvector maps (base map data). These units will generally allowadditional maps to be uploaded but these are only available from themanufacturer, in a proprietary specific file format, so there is thepotential for some lack of flexibility when choosing to buy a mappingGPS unit. Garmin and Magellan are the two major manufacturers whosemapping GPS unitsuse proprietary only maps. Having said all this however, you can stilluse other non-proprietary digital maps but not for the purpose ofloading the map to the screen, but for the transfer of attributes toyour GPS (eg. waypoint file). To transfer waypoints and other datafiles to your GPS you will require mapping software.
If you have the USB cable and a dvd/cd that contains the software/maps, then it needs to be loaded. Install the software on your computer. With the unit off, plug it into USB, then turn on unit. run program installed from dvd/cd. you can also try resetting the unit by holding down the Menu and Nav key, hopefully a small box appears and you can use the stiff stick to change the numbers. if this does appear, change the numbers to read 32 then press the stiff stick in (pressing enter).