I have an old etrex ( it has a an RS232 serial port cable, with a usb concerter cable…nobody said this had to be pretty…
It works fine with PC. NOT Mac compatible due to USB bus issues in the Mac. I use Memory Map to store and create routes. The Etrex has a waypoint limit, so you need to be frugal with your points on the route, but other than that my only issue is:
It uses my bearing to calculate which direction it is pointing. This is fine once you are on the move, but if you start at an unknown location, and rely on the GPS, you can head off in the completely wrong direction.
Also, I'm now considering the purchase of a HRM, and it seems prudent to combine the 2. Edge 705 me thinks, when I'm feeling rich…