11/15/2023 0 Comments Relative motion definitionThis line is called the direction of relative motion (DRM) line.ĥ. Extend a line from R through M and past the center of the sheet. More later on why we choose an interval of six minutes.Ĥ. Wait six minutes and repeat steps 1 and 2, marking the time. Plot this position on the plotting sheet, marking the time. Note the time (only the minutes need be recorded).Ģ. Identify the target and determine its range and bearing using the features on the radar. Here are the steps needed to effectively plot a target and resolve its actual motion:ġ. The process for plotting and analyzing a target on a maneuvering board takes just a few minutes. Or the navigator can use a maneuvering board plotting sheet and simple nav tools. One is to let the radar do it radar with ARPA (Automatic Radar Plotting Aid) or MARPA (MiniARPA) installed can do this automatically but requires input from an electronic compass. This is often called ‘solving the RTM triangle’ (RTM is an acronym from the words relative, true and motion). The first goal is to answer the question, ‘Is the target going to hit us?’ Next, if needed, the navigator can come up with the target’s actual course and speed. To get the most information out of the radar, the navigator must separate the two motions from each other. This results in our display showing relative motion, a combination of our vessel’s actual motion and the target’s actual motion. As soon as our vessel begins to move forward, it imparts a motion on all targets on the radar display (on the most common heading-up display, our motion in effect slides everything straight down the radar screen). If our vessel (at the center of the screen) is standing still, then every object showing movement on the radar screen is showing a true (actual) motion.
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