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Mini-automatic radar plotting aid (or MARPA) is a maritime radar feature for target tracking and collision avoidance. Targets must be manually selected, but are then tracked automatically, including range, bearing, target speed, target direction (course), CPA (closest point of approach), and TCPA (time of closest point of approach), safe or dangerous indication, and proximity alarm.
A typical shipboard ARPA/radar system. A marine radar with automatic radar plotting aid (ARPA) capability can create tracks using radar contacts. [1] [2] The system can calculate the tracked object's course, speed and closest point of approach [3] (CPA), thereby knowing if there is a danger of collision with the other ship or landmass.
Pages in category "Radar" The following 151 pages are in this category, out of 151 total. ... Mini-automatic radar plotting aid; MISTRAM; MIT Radiation Laboratory;
The system included bridge control, power management, load condition monitoring, and the first ever computer-controlled, radar-sensed anti-collision system (Automatic Radar Plotting Aid). Taimyr' s Nord-1 turned out reliable for the time, with more than a year between failures.
The environment allowed radar station personnel to monitor the radar data and systems' status (e.g., Arctic Tower radome pressure) and to use the range height equipment to process height requests from Direction Center (DC) personnel. DCs received the Long Range Radar Input from the sector's radar stations, and DC personnel monitored the radar ...
A Raymarine chartplotter. A chartplotter is a device used in marine navigation that integrates GPS data with an electronic navigational chart (ENC).. The chartplotter displays the ENC along with the position, heading and speed of the ship, and may display additional information from radar, automatic information systems (AIS) or other sensors.
In addition to the communication and maintenance van, other AN/MSQ-77 trailers were the 33 ft (10 m) radar van with roof-mounted Cassegrain antenna, "control and plotting van, two diesel generator vans, [and] an administrative and supply van" which were emplaced as a military installation at the surveyed site. [10]
In 1944, the US Army contracted [7] for an electronic "computer with guns, a tracking radar, plotting boards and communications equipment" (M33C & M33D models used different subassemblies for 90 & 120 mm gun/ammunition ballistics.) [3] The "trial model predecessor" (T-33) was used as late as 1953, [8] and the production M33 (each $383,000 in 1954 dollars) [9] had been deployed in 1950. [10]