A GPS set gives your position to within 20 metres, anywhere on earth. Punch in your destination and the machine gives the data you need to sail or motor to your target. The dream of navigators through the ages - always to know exactly where they are and where they are going - has been realised. This book explains, to the novice or traditional navigator, what the system can and cannot do. You will learn about choosing a set, position fixing, outputs, waypoint navigation, passage making and pilotage. In a very short time you will be entering Waypoints, planning Routes and watching the Crosstrack Error as though they were old friends. You will also understand how to check your results using traditional navigation, common sense and the Mark 1 Eyeball.