I running a MacBook Pro, Mac OS X, Version 10.6.2, 2.2 GHz Intel Core Duo.
My intended application is to run the TAT (Trans American Trail) from Jellico, Tn to Moab, Utah. The TAT is a collection of GPS plotted rural roads and paths across the backside of America, thus the need to work with MapSource to "draw" or "map" the track.
Those who have run the TAT on their motorcycles suggest the Garmin GPSMAP 60CSx, but I have no idea if this unit is MacIntosh compatible.