I first owned (actually still do) a Garmin 45XL. Worked pretty well, even when the old SA was still active. Have also used a Magellan ProMark X. That thing sucks the life out of the batteries like nobodys business. I now use a MeriGreen. It is the best. Use TOPO with it. Picked the Merigreen because of the map screen and Topo capability, plus the memory is not fixed like the Garmins.