This pocket-sized guide is a quick reference for all seafarers to the essential navigational lights, shapes, and seamarks which abound off the coastline all over the world.Laid out simply & clearly for quick accessibility, it enables crew, navigators, skippers and even casual day guests aboard to quickly identify the lights, marks and shapes being displayed by other ships at night as well as during the dayIt''s easy to confuse (or forget) what particular lights, marks and shapes mean--especially under stress or in the dark--but with this handy book, help is quickly at hand. A ready reckoner reminder of:-Cardinal buoys and channel markers -Lights displayed by ships at night (tugs, dredgers, pilot vessels, stationary vessels, fishing boats, yachts, motorboats) and from all aspects (front, side, astern) -Daytime shapes displayed by boats (e.gfor anchoring, towing, diving, dredging) -Ships'' sound signals (used in fog) -Signal flags and their navigational meanings (I am dragging my anchor;