I also use a NG topo map that i would print. On backpacking trips i would turn on the gps once in a while check my location, also make a mark on the map. This way i got a back up. If you turn on the GPS once every 30-45 min to get your location a pair of batterys would last for the all trip and then some.
This is the way for using your GPS. The last thing you want it to be walking through the woods, with your head buried in a GPS screen, not paying attention to what is going on. Although mine does have all the fancy downloaded topo maps, it is NOT needed at all and I really regret not just sticking with my older model.
The reason is, trying to zoom in and out on those topos screens is way too time consuming when trying to get a general feel for the area. I use printed out USGS maps from Maptech's program. You can zoom in for real detail, but you also get the overall feel of the area very easy.
Here is basically how I use my GPS, even for Geocaching:
- Mark your starting point/camp/destintation, etc.
- Once ready to find it, fire up the GPS and do a "goto"
- I have mine set up to show the bearing to your active go to. Read the bearing.
- Turn off GPS.
- Shoot bearing with compass.
- Walk that direction for awhile, and then go through the process again to check bearing, and re-shoot your bearing with the compass until you are there.
No fancy features, maps, etc needed. Just the ability to mark points, and read bearings. The GPS is the back up, not the main tool.
Here is a really good read on using this type of method:
Backcountry Navigation