Hi there,
In order to avoid nervousness in future about the GPS you could contact Garmin and ask them if they have a record of the unlock code for your GPS (if the previous owner had registered the unit, Garmin will have a record of it matched to the serial number of the unit)
Once you have an unlock code you can borrow or burn a copy of the MapSource CD from someone and you'll always be able to load the maps onto the unit again.
David
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