Book excerpt: The modern sailor is an electronic navigator. New boats come stacked with GPS, chartplotters and radar, on a bewildering array of screens and displays. With this book learn how to navigate using all of these electrical devices. Practical Navigation leads you through all the aspects of boat navigation in a logical order, using a combination of modern and traditional methods. This practical approach ensures that although modern electronic methods remain at the forefront, readers will never lack in knowledge to navigate their boat safely in any circumstance. Topics covered include GPS, the shape of the Earth, finding your position, passage planning, radar and personal computers.