If I'm in my own neck of the woods I usually only take a compass, and that's more or less just for stand orientation and wind direction check.

However, I have been hunting numerous times in some pretty wild country, where if you get lost you are most likely going to spend the night. When I hunt places with vast amounts of wilderness I always carry both and extra batteries too. In my opinion many people can't navigate very well in a wilderness setting with a compass only. Generally, some sort of orienteering training is required if you are planning on using map and compass only on a wilderness hunt. Many people cannot read a topo map to save their life, so in a situation like that the compass is not all that much help. However, if you save waypoints on your GPS (like the location of the truck, or main trail) it is a snap to navigate. When it's time to head out of the woods, turn on the GPS and select the go to function for the waypoint you want to navigate to. The GPS will give you the bearing and distance, then all you do is use your compass to maintain the bearing. Works every time.

With that said, it is still a good idea to learn how to use map and compass only. The GPS could always break... Jim