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line of position Any line that marks the location of a boat, such as a bearing to a lighthouse in coastal waters or a sun line from a celestial sight at sea. With one known LOP, the boat is known to be located somewhere on that line, but the precise place on the line is not known. Generally, a position fix is found from the intersection of two or more LOPs. In celestial navigation, each sextant sight yields one LOP, so it takes at least two sights of different bodies to get a fix. See Plotting LOPs, Sun Lines, and Circle of Equal Altitude. See also circle of position Abbreviation:  LOP

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