Customized for general aviation pilots, this fact-filled reference examines GPS in depth, explaining the theory behind its operating, detailing its accuracy and limitations, covering the entire scope of air applications, and predicting what the future holds. This edition contains new information on recent satellite launches , use projections by both civilian and military entities, differential GPS, and FAA decisions. Illustrated examples of GPS hardware give the reader a hands-on "feel" for using digital readout and moving map GPS receivers. Other features include an up-to-date buyer's guide to GPS receivers and appendices with chart reference systems.