Book excerpt: Fernhurst Books' compact, handy guides to navigating at sea, nautical calculations and passage planning bundled together in e-book form for the first time. The perfect quick reference guides to keep on your phone or tablet, easily accessible when you are on board. They contain all the essential information for when you need it most about navigating and passage planning. The Navigation Companion covers all the navigation essentials: charts, compass, tides, standard and secondary ports, dead reckoning, estimated position, course to steer, lights, GPS, waypoints and buoyage in a highly illustrated format making it easy to understand at a glance – ideal for those moments when you need an answer, and you need it fast! The Nautical Calculation Companion is an aide memoire of those calculations frequently needed (but often forgotten) for traditional coastal and offshore navigation and other equations and formulae which can be useful afloat. Each topic has worked examples, and there are frequent diagrams to illustrate the process. The Passage Planning Companion details the timetable for developing a passage plan and goes through all the elements you should consider: port information, routeing, weather, tides, timings and safety. It then takes you through ship management on the passage: the crew briefing, roles, routines, pre-sail checks, watch keeping and much more. This will be a valued companion when planning and executing a sea voyage.