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mark Mark often means some point of interest (POI) on a nautical chart. If such a mark is used as part of a route, it is usually called a waypoint. Mark can also refer to an aid to navigation, such as a daymark, which is a coded graphic sign on a post, explained in the Light List. As a verb, it is sometimes used in navigation as a way to communicate a specific observation, such as the time of a sextant sight or compass bearing. One person does the measurement, and when they think it is right they say "mark" and their assistant records the precise time of the event.

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