Automatic Radar Plotting Aid, ARPA, gives a maritime radar the possibility to follow targets resembling other ships, calculating their course, speed and possible collision with own vessel. This long range radar antenna (approximately 40m (130ft) in diameter) rotates on a track to observe activities near the horizon. ...
Development of ARPA started after the tragic accident when the Italian liner SS Andrea Doria collided in dense fog and sank off the US east coast. ARPA radars started to emerge in the 1960's, and with the development of microelectronics such systems are now available even for small yachts. S.S. Andrea Doria of the Italian Line, 1953 The SS Andrea Doria was an ocean liner sailing from Genoa, Italy for the Italian Line. ...
Every automaticradarplottingaid installation required to be provided shall comply with the performance standard adopted by the Organisation and shall, in the case of a United Kingdom ship, comply with the relevant performance standard.
—(1) Where the automaticradarplottingaid installation is provided as an additional unit to a radar installation it shall be sited as close as is practicable to the display of the radar with which it is associated.
(2) Where the automaticradarplottingaid installation forms an integral part of a complete radar system that radar system shall be regarded as one of the radar installations required by regulation 3(4)(b) and accordingly shall comply with the relevant requirements of Part IV of these Regulations.
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