![]() Your GPS can calculate this because it knows where you were five seconds or five minutes ago, and it displays the number on the fly from the known start and ends.Ĭalculating COG between two fixed points is easy, it's just plotting points and measuring. If you know where you are now, and you know where you were five minutes ago, describing your COG is just a straight line back to where you were. Heading is instantaneous, we derive COG from your boat's motion over time. The heading is the compass direction your boat is pointing, and it may not match COG if you have current and tidal effects. It is the path the boat travels relative to the bottom, no matter which way you're sailing.ĬOG is not Heading. It doesn't matter what your compass heading was or your angle of sail off the wind, your "Course Over Ground" is literally that line you drew on the bottom. COG - A Complete DefinitionĪt its simplest level, imagine your sailboat dragged a chain on the bottom as you sailed, leaving a line through the mud and sand. Dead reckoning? Adding currents? We'll cover the basics for you and make it crystal clear.
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