mustangcats wrote:I agree, a GPS receiver is a good thing to carry. Be sure to have spare batteries. However, depending on the terrain or tree cover, it is sometimes very hard to lock onto the minimum number of satellites required.
Look for GPS receivers that are rated for heavy tree cover and city canyons. I know it isn't made any more, but my Garmin GPSmap 60CSx is wonderful in this respect. With the optional patch antenna I've gotten satellite lock in parking ramps. The SiRFstar III receiver is very good. You can still get it in some puck receivers and I now have an external bluetooth one for my tablet.
Yes, use those paper maps. Take the GPS out and put a mark where you started, and a mark every so often along the way, but mark those paper maps too. The GPS is a tool. Over reliance on it can be a problem. Back it up with alternate tools. Learn how to take a GPS fix and plot it on your paper map. Also learn how to take a lat-long from your paper map and make a GPS way point from it. The same techniques are used for plotting a ship's course as plotting a course on land. Learn how to use a sextant and you can now do it sans electronics.
The Garmin GPSmap 60CSx uses 2 AA batteries and will run a bit over 24 hours on a pair. Many other things I carry also use AA batteries. This is very deliberate. The batteries for one can be used in a different device in a pinch.

I remember buying head lamps one day. The sales man was adamant the one that was powered by AAA batteries was the best one to get. I simply told him, all the rest of the electronic devices I carry when hiking use AA batteries, why would I want to carry yet another spare battery type. Furthermore, AA batteries are ubiquitous. They are everywhere in the USA. It worries me with many devices going to built in non replaceable batteries. It means you have to have some way to recharge them if you want to use them for longer then their battery life. Looks like USB cable recharge is the wave of the future. Even my little toy helicopter uses it.
As for getting lost. I think way to many parents don't teach their kids how to pay attention to where they are going. What are the land marks along the paths of their lives. A fallen tree, coffee shop on the corner, scratches 6 feet up on a tree, clock on the wall, cross path, alley entrance, babbling brook, plaza and fountain, rock grouping, recessed doorway, huckleberry bushes, blind driveway, old stone wall, large hedge row, large overhanging branch, cable bridge, 4 palm trees forming a W, etc..