Coastal Navigation - U.S. Sailing Certification Author:Tom Cunliffe Navigation is the science of establishing your position and managing your yacht's progress with a minimum of risk and a maximum of enjoyment. Coastal Navigation's visual layout, full of graphs, charts and diagrams, covers chartwork, aids to navigation, tidal heights, tidal currents, estimating your position, electronic navigation aids, poor visi... more »bility and many other topics.« less