content: I used to geocache and so I read this book with interest. The information is misleading ("GPSr: Slang of a GPS receiver." An initialism is hardly "slang") to slightly dangerous (the author recommends turning off the GPS for most of your trek to "save batteries." Instead of losing your breadcrumb trail back to your camp or car, why not just carry spare batteries?).It appeared to me that the author had never really spent much time geocaching. Take his advice with a grain of salt.