A Gps User Manual: Working With Garmin Receivers

Rating:
Summary: If you tinker with Garmin GPS devices, you probably want it.
Review: I'm enjoying this book. If you are interested in playing around with Garmin GPS devices (GPS is a sort of hobby for many), you probably want to get it, and the 4 star rating is for you. However, if you want a book about GPS in general or about brands other than Garmin, this isn't the book you want.
Much of the book amounts to a more detailed owner's manual than what Garmin gives you. It covers handheld units pretty well but is not intended for other GPS device categories like aviation. In covering many different models, it also accomplishes a lot of comparison between their user interfaces and other features. I like that it does a better job than Garmin's manuals of explaining how to think about the user interface - that is, the strategy behind it.
There's also info on using Garmin software, and some explanitory info on things like DGPS and WAAS, the NMEA interface, external antennas, and similar related stuff. There's an entire chapter on secret keystroke sequences that access undocumented abilities (not that these are all that powerful). I would have liked more of this ancilliary information, more depth and variety, but did appreciate what there was.
One unusual downside: this book may have the most typo's of any I've read. I bet there's about one per page, of the sort where another word is substituted ("use" instead of "user", "you" instead of "your") as if they only used a spell check. But that hasn't interfered much with using it.