my 600 has several gps file depot maps on an sd card. they used to work but now don't?
Plus the unit just decided to totally screw up all of the sudden, all my set up settings got deleted or something?
HELP!!
What is a "600"? Oregon? Montana? Seems like a number of things could cause a problem like that, could be as simple as an SD card that isn't firmly seated, bad battery connection or a hardware problem with the GPS.
Try removing the card and install a map in internal memory. Does that work? Is your firmware up to date? Did you recently update it before this happened?