Absolute bearing
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In nautical navigation the absolute bearing is the angle formed by the North direction and an object observed from the vessel. If the north used as reference is the true geographical north then the relative bearing is qualified as true whereas if the reference used is magnetic north then the relative bearing is qualified as magnetic.
The relative bearing is measured with a bearing compass.
The measurement of absolute bearings of fixed landmarks and other navigation aids is useful for the navigator because this information can be used on the nautical chart together with simple geometrical techniques to aid in determining the position of the vessel and/or its speed, course, etc.
The measurement of relative bearings of other vessels and objects in movement is useful to the navigator in avoiding the danger of collision.
