First of all, that feature is not on all models so you better see if you have it.
How it works...
For example: if you were in a strange city and you parked your vehicle in a parking garage when you take the GPS out of the mount it saves your current location as a waypoint named "Last Position". If you then wander/tour the city for the a few hours or day and take the GPS with you, you can always find your way back to the car (or at least the garage). Simply power up the GPS, wait for a satelite lock and do a "GoTo" the "Last Position" waypoint saved as a favorite. You're basically just using it as a handheld.
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