While some of these acronyms are relatively well assimilated by the boater, as SOG for Speed Over Ground (SOG), you can quickly access subtleties that are not always mastered as COG for Course Over Ground, meaning "route runned on the ground", that the word "Course" in English can mean "Route" or "Heading" according to the context.ĬOG is the angle between the course of the ship relative to Geographic North (or True North), not to be confused with HDG Heading (compass heading) which can be either a Magnetic Heading HDM, angle counted relative to the Magnetic North, or HDT for Heading True, angle counted relative to Geographic North. This facilitates on-screen display taking few space. These acronyms, in the form of three letters most often, are the contraction of terms defining specific navigation data and according functions. This coded and cryptic language was originally developed for electronic navigation instruments, GPS mapping and other chartplotters. Navigation applications are full of acronyms.
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