The reason to buy this book is that it combines "how to" information - the necessary technical background in GPS, navigation, and hiking, along with some history of the geocaching activity as well as some narrative spots that give readers a sense of why they should get involved.
This book is a comprehensive guide to geocaching, a leisure activity using GPS technology for a high tech treasure hunt game. It is the only book out on something that has been growing at exponential rates since its introduction in 2000 and that has received wide coverage on television, on radio, and in newspapers and magazines. It is particularly popular with extreme sports and high tech aficionados.
