This 1958 unclassified U.S. Navy training film by De Frenes Co. is about relative motion and the maneuvering board, which are used to help set a ship’s course. Multiple destroyers move through the water close to each other. Drawings of relative plots and vector triangles on paper with multiple tolls needed are shown (:35-1:23). A maneuvering board is explained in detail, including the plotting circle and azimuth circle lines. How to use the printed scales is diagramed. Time, distance, and speed can be determined in relation to each other using the printed numbers and a compass (1:24-4:52). Plotting. Drawing instructions include how to determine a vector triangle and relative plot (4:53-7:29). Vector Triangle. How to use a vector triangle to make decisions regarding the maneuvering ship, the reference ship, and the direction of relative motion are detailed (7:30-8:44). Solving Own Ship’s Course. How to determine the relative plot is shown by drawing a vector triangle and using a compass (8:45-12:34). Solving for Direction of Relative Motion. The radar tower is in motion on a destroyer. The bearings and time are marked on the maneuvering board to determine a relative plot for when the other vessel will pass and to avoid a collision (12:35-16:58). Determining Relative Speed. An officer works on a maneuvering board with pipes and equipment behind him. How to determine relative speed is shown (16:59-18:35). Maneuvering Ships True Course and Speed. A vector triangle is plotted (18:36-20:14). Previous images are flashed by as the benefits of using a maneuvering board are stated (20:15-21:50).

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This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD, 2k and 4k. For more information visit http://www.PeriscopeFilm.com