The exercises in GPS The Easy Way use Ordnance Survey mapping and British National Grid co-ordinates to guide the user through all aspects of using a gps for navigation. Exercises are replicated for the user's own region of UK. This is the 2nd edition of UK's best selling GPS manual. Synopsis The exercises using OS mapping and BNG co-ordinates deals with the GPS navigation for walkers. Exercises are replicated in the user's own region of UK. This is the 2nd edition of UK's best selling GPS manual.