https://peertube.dngr.us/videos/watch/bf8d7274-e7fa-4511-af23-fc429f74fd93 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. This instructional explains how to use the maneuvering board, a tool designed by the U.S. Navy to solve navigation problems involving relative motion between ships. It demonstrates how to construct and interpret two key diagrams: the relative plot, which shows changes in bearing and distance over time, and the vector triangle, which mathematically relates the directions and speeds of ships. Viewers learn how to use the board’s built-in azimuth circle, scales, and nomograph to determine critical navigation data such as relative speed, closest point of approach (CPA), and true course and speed of other vessels. Through practical examples, the shows how to track moving contacts, calculate the direction of relative motion, and determine own ship’s required course to reach a given station. The maneuvering board is emphasized as an essential and time-saving tool for naval operations, offering precision and efficiency in complex maneuvering and tracking situations. 0:00 – Introduction to solving problems in relative motion during ship maneuvers. Solutions use two diagrams: a relative plot and a vector triangle. 1:31 – Overview of the maneuvering board, a Navy tool designed to simplify plotting direction, speed, and position. 2:00 – Explanation of the azimuth circle and scales on the board used for plotting bearings and selecting an appropriate distance scale. 3:15 – Use of the time, distance, and speed nomograph to quickly convert two known values into the third. 4:55 – Introduction to plotting two diagrams: vector triangles (for direction/speed) and relative plots (for bearing/range). 5:50 – Example of a relative plot where a ship's relative movement is plotted from one bearing to another to determine direction and distance. 7:01 – Use of the board's bottom scales to determine relative speed between two positions using time and distance. 7:34 – Introduction to the vector triangle, used to find unknown speed/direction based on known factors. 8:47 – Solving a real navigation problem: determining the course to an assigned station using a relative plot and vector triangle. 10:00 – Using direction of relative motion to draw a vector triangle that helps determine true course and speed. 12:37 – Solving for direction of relative motion using radar contact data and plotting bearings over time. 14:43 – Determining closest point of approach (CPA) by drawing a line 90° from the direction of relative motion. 16:02 – Using the maneuvering board to find how far another ship will pass ahead or astern of own ship. 17:02 – Determining relative speed using plot distance over time and verifying using the nomograph on the board. 18:39 – Calculating true course and speed of another ship using a vector triangle with own ship's known movement and relative motion. 20:15 – Recap: the maneuvering board helps solve navigation problems by determining direction, speed, and distance with separate roles for the relative plot (geographic) and vector triangle (mathematical). 21:29 – Final advice: consistent use of the maneuvering board ensures efficiency in navigation duties throughout a naval career. Motion picture films don't last forever; many have already been lost or destroyed. We collect, scan and preserve 35mm, 16mm and 8mm movies -- including home movies, industrial films, and other non-fiction. If you have films you'd like to have scanned or donate to Periscope Film, we'd love to hear from you. Contact us via the link below. 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 Source: https://www.youtube.com/watch?v=j197C0XuNUA Mirrored from Periscope Film (https://www.youtube.com/@PeriscopeFilm) Sat, 13 Jun 2026 13:26:14 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.dngr.us https://peertube.dngr.us/lazy-static/avatars/41a6fee9-7f57-42d0-a5fc-5db4f1af2e31.png https://peertube.dngr.us/videos/watch/bf8d7274-e7fa-4511-af23-fc429f74fd93 All rights reserved, unless otherwise specified in the terms specified at https://peertube.dngr.us/about and potential licenses granted by each content's rightholder.