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| Posted by infr-GDT44 Navman MY 300 LMT Sleep and Lock Can anybody clarify the functions at shut down of "SLEEP" and "LOCK". on a Navman MY300 LMT. I find it frustrating that the unit turns on when applying external power but does not turn off when power is removed. Therefore, when used in a vehicle you have to manually turn it off to save flattening the battery!!. Joe |