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- 16:37, 7 April 2024 John Leach talk contribs deleted page Automatic Radar Plotting Aid (content was: "{{PropDel}}<br><br>{{subpages}} An '''Automatic Radar Plotting Aid (ARPA)''' provides an interface between visually-oriented radar displays and or marine navigation computers. Where a radar screen displays a target as a "blip" of light relative to the radar antenna, such that the basic computation of bearing is manual, and determining course and speed requires multiple manual observations and measurement, the ARPA sends a digital message, for each target, to the "master" scre...")