>>293440I don't have the time to fuck with that all day long.
I keep GPX's on my computer of areas I ride. It's easy enough to throw some tracks in there, then squirt tracks/waypoints into the receiver that'll overlay on whatever map (if any) is installed.
For sharing data between people who may or may not have the same receiver or mapset, a common file format like GPX makes exchanging that data very easy.