I have been using GPS since the satellite algorithm was encoded by the US Army and we had to set up a base station to decode our data. I like a GPS that has a very good antennae to receive signals well and is intuitive to use. I thought I would share my suggestions in case you are interested. I prefer the Garmin brand but I think Magellan still makes good units. Feel free to get in touch with your comments. A basic model is the Garmin eTrex 10 (eTrex 20 is good too). The model I like best is the Garmin 60CSx, which they don't make anymore (though you can find them online) and have been replaced with a fancier color Garmin GPSMAP 64, which is a great GPS.