Also last weekend I borrowed Dorothy's Garmin Etrex GPS unit to see if I can connect it to my Macintosh (OSX Snow Leopard). Whilst Garmin has now introduced support for USB connections to Macintosh computers, I have not been able to connect to the older serial cable models. I had bought a cable via eBay, connected it to my Keyspan serial to USB converter, and finally found software (LoadMyTracks) that will download from the Etrex. It worked perfectly!
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Click here to download the GPX data for this map. Note, this data is an XML file - change the name to .GPX to upload to your GPS.