Over the last decade I have become a friend of the author, David Brawn, of GPS The Easy Way. His book has been the best selling gps manual on the UK market ever since it was first published in 2003, and then rewritten in 2006, selling tens of thousands of copies. But it is a book of its time, way back in 2003. It only deals with basic gps units such as the eTrex, the examples in GPS The Easy Way are based on the Garmin 12XL unit that introduced David to gps navigation, recording walking routes, using third party software such as Oziexplorer and GPSU.
Talking to David he admits that the book is now 'old hat' though all the principles of GPS The Easy Way are as relevant today as ever, but due to its time line his publishers are making a pdf version of GPS The Easy Way available as a free download on their website.
I can't encourage you to buy this seminal gps publication when it is available for free as a pdf download on the Discovery Walking Guides website.
We are now a decade (almost) on from its first publication but the gps world has moved a whole techtonic shift since then. Mapping gps units such as Adventurer, Lowrance Endura, SatMap, Garmin Oregon, Magellan Explorist et el. 3G phones and their apps are the new must have for outdoor adventurers. I hear from David that DWG are about to publish a new 'Choosing and Using a GPS Unit' section of their website including a section on 'Get a Mapping GPS Unit for Free' covering 3G phones as gps mapping units.
It sounds like 'state of the art' in gps navigation for all us walkers.
Much as I have loved the adventures in David & Ros Brawn's Walk! guide books backed up by their Tour & Trail mapping I have to sadly say that GPS The Easy Way is now only worth buying, free download at DWG website, as a collectors edition of the guy who pioneered gps navigation for a couple of generations of UK hikers.