[OSM-newbies] Connecting to eTrex to Mac

[Cas Morris]

Hi everyone, I've just started to do some GPS track logging, but I'm
having difficulties making my Mac see my eTrex. I have bought a
Serial-USB power / data cable from GPSbitz.co.uk, and installed the
Prolific PL2303 driver software. I was hoping that was all I would
need to do but the GPS unit doesn't appear on the desktop when I plug
it in.

There is a bit about this on the OSM help pages, but to be honest I
don't really understand all the stuff about using Terminal. Do I need
any other software to make this work? Any help gratefully received!

I have a yellow Garmin eTrex and a G5 iMac running OSX 10.4.10

Thanks,
Cas.