![]() ![]() PilotingĪ bearing can be taken on another vessel to aid piloting. These types of bearings are sometimes termed limit bearings, aim-off bearings, danger bearings, or index bearings. Upon reaching the road, the navigator simply turns west to ensure he will reach the destination. Similarly, a land navigator might walk a bearing several degrees to the east of his actual course to avoid difficult ground, or to intercept an intersecting position (such as a road or trail) leading to his/her destination. Or, if moving through a channel with obstructions to the west and which is not well-marked with buoys, it can be decided that the vessel might have to stay to east of a particular charted object. If it does not, an anchor watch must inform someone to take action. For instance, if anchored in a harbor with a shore to the north, it can be decided that the vessel must stay to the south of an object to its east. However, a pre-calculated bearing to a charted object can be also be used as a precautionary measure. This bearing can be used to determine the position of the vessel or landmark when used in conjunction additional bearing(s) or other information (e.g. Use of bearings Determining a positionĪ bearing can be taken relative to a charted or mapped object at a specific time. Under this definition, for example, a given azimuth in degrees would be expressed as 60°, while the equivalent bearing would be expressed as N 60° E. In contrast, an azimuth was a clockwise measurement of a circle from a zero point at a fixed horizontal plane of reference (such as a north meridian), expressed in degrees, mils, or other unit of angular measurement. More specifically, a bearing was measured both east and west from north and south, divided into four quadrants. In land navigation, a bearing was traditionally defined in land surveying terms as a fixed number line which gave the smallest arc (never to exceed 90 degrees). ![]()
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