In reply to David Coley:
Also, something you can do with a handheld mapping GPS that I don't think you can do with a GPS watch is "project a waypoint".
To explain: one winter night we were snowshoeing sometime after midnight up along the Fenton River in Connecticut. Minus 8C, windy with swirling powdery snow coming down we were following a glint trail through a state forest. The glints ended at a icy, deep gorge with high, fast water flowing. The gorge was about 20 meters across and deep enough to be scary. We could see more glints off in the distance on the other side. But, we only had snowshoes and Micro-spikes, not proper crampons. There was no way I was going to cross down because one slip and we'd be swept away. But, I could see on the GPS that there was a foot bridge about 0.5 km upstream.
So, I used the GPS to waypoint (mark) where we were and then used the GPS to take a compass bearing and estimate a distance on the other side to where I thought the next glint was. With the bearing and distance, I marked (projected) another waypoint on the other side. We hiked upstream, found the foot bridge, crossed and set a course to bushwhack to my projected waypoint. Once there, we picked up the glint trail and continued on. All in all a nice adventure.