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I have recently purchased  an eTrex 30x. I have downloaded maps  from GPSFileDepot (Nebraska, Wyoming, Montana, & Idaho). On my computer (Windows 7), Garmin BaseCamp
displays map details, but when the map(s) are transferred to the
Garmin eTrex 30x, the maps on the GPS unit only displays the simple (and useless)
default map(s).