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Constant bearing, decreasing range (CBDR) is a term in navigation which means that some object, usually another ship viewed from the deck or bridge of one's own ship, is getting closer but maintaining the same absolute bearing. If this continues, the objects will collide.
Commonly referred to as Constant Bearing Decreasing Range (CBDR), the concept continues to prove very useful for conning officers (the person in control of navigating the vessel at any point in time) because CBDR will result in a collision or near miss if action is not taken by one of the two vessels involved. Simply altering course until a ...
In satellite broadcasting, a bearing is the combination of antenna azimuth and elevation required to point (aim) a satellite dish antenna in a given direction. The bearing for geostationary satellites is constant. The bearing for polar-orbiting satellites varies continuously. A and B are near the North Pole and facing each other.
English: Diagram showing principle of Constant Bearing, Decreasing Range in marine collision avoidance. When an observer sees another vessel at a constant bearing and the range continually decreases, collision is imminent.
Constant bearing, decreasing range, a term in navigation This page was last edited on 15 December 2024, at 17:42 (UTC). Text is available under the Creative ...
In sailing, it has long been known that if the bearing from the target to the pursuer remains constant, known as constant bearing, decreasing range (CBDR), equivalent to taking a fixed reference point at infinite distance, the two vessels are on a collision course, both travelling in straight lines. In a simulation, this is readily observed as ...
The process of keeping track of where the ship was likely to be was called rangekeeping, because the distance to the target—the range—was a very important factor in aiming the guns accurately. As time passed, train (also called bearing), the direction to the target, also became part of rangekeeping, but tradition kept the term alive.
Bearing (navigation) Blown off course; Bowditch's American Practical Navigator; ... Constant bearing, decreasing range; D. Daboll trumpet; Dalsfjord Lighthouse Museum;