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True, Magnetic and Needle Course: Definitions Courses are defined in terms of the meridian taken as the origin (true, magnetic or needle) and the bow-stern line of the vessel. TRUE Course (Rv): The angle formed by the true meridian of the place and the bow-stern line. MAGNETIC Course (Rm): The angle formed by the magnetic meridian of the place and the bow-stern line. Read more

Did you know that the Earth's magnetic poles do not exactly coincide with the geographic poles? Because of this, the magnetic declination is calculated at a specific point. An essential concept for both maritime and air navigation. In this article we will explain everything you need to know about what magnetic declination is and how to use it. Read more