GPSInstant Navigationby Kevin Monahan and Don DouglasIt is perhaps a contradiction to have a detailed book on a system of navigation that is designed to be so simple, yet GPS Instant Navigation is helpful for navigators who want a little more out of their GPS than latitude and longitude.

Most GPS receivers are actually a magic box of potential for a variety of navigational usesman-overboard recovery, voyage planning, and basic piloting. This book should make even the most hardened of traditional navigators understand how useful these little devices can be if allowed to fully function.

Fine Edge Productions, Bishop, Calif.; 760-387-2412; 315 pages; $29.95.

By Ocean Navigator