How is triangulation used in navigation?

Triangulation is a fundamental method in navigation used to determine a vessel's position by measuring angles from known points. This technique relies on having at least two or three fixed reference points, such as landmarks or navigational aids, which are points with a known location. By measuring the angles between these known points and the vessel, navigators can create intersecting lines of position (LOP). The intersection of these lines reveals the vessel’s precise location on a chart. This method is particularly useful when GPS signals are weak or unavailable, ensuring that navigators can still find their way accurately using identifiable landmarks.

In contrast, calculating a vessel's speed, identifying weather changes, or plotting a course based on wind direction involves different methodologies and does not apply the principles of triangulation in determining position.