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It does happen i have heard of it happing with a older garmin models apparently something to do with a faulty/flat lithium battery that stores the marks in the unit. Since hearing this i have taken the precaution of backing up my marks on my computer using a program called garmin map source. It a great Little program and will save me the heart ache is something like this was to ever happen. It also makes my marks easily transferable to a new/or portable gps. Worth looking into