It's a great book geared towards navigating in the outdoors in particular, rather than autonavigation, marine navigation, etc. It goes in depth into how to use bearings, orienting yourself, direction finding, and a substantial amount of info in navigating without a GPS by using a compass, paper topo maps, the sun, the stars, and so forth.
It is, by design, not an outdoor survival guide, but it does cover the basics for hiking and points to more detailed sources when necessary.
I really enjoyed how well the author taught the concepts of latitude, longitude, bearings, datums, declination, and so forth.
Towards the end of the book, the author even includes some fun GPS-based games you can organize, discusses geocaching, and compares different GPS receiver models.
This book goes beyond the receiver's manual and actually teaches you how to navigate. One of the big points it makes is to find what direction you need to go, find an intermediate waypoint, PUT YOUR RECEIVER AWAY, and head off in the proper direction. This keeps you from walking over poison ivy, off of cliffs, into trees, and generally aware of your surroundings. Once you get to your intermediate destination, pull the receiver out and find your next step. I'm new to wilderness navigation and this was certainly an "aha" moment. Who wants to be focusing on the GPS device the whole time when you could be taking in the beauty of your surroundings instead!