http://www.stormcam.org/etrex-legend/
Then the Garmin eTrex Legend retrieve map data from a Mac G4 …. how?
The eTrex is supplied with a serial cable only. Is it possible to adapt it to a USB port and use it with my iBook G4?
You need some number of things. 1) Mac compatible USB to serial adapter 2) Virtual PC on the Mac. MapSource does not yet work on a Mac, but it is being developed
Garmin Etrex Legend Cx