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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.
MARPA's members include many air carriers from around the world. MARPA has an air carrier committee that remains quite active. [4] The committee was originally formed by MARPA Director Josh Abelson, and since then has been chaired by Cori Ferguson of Alaska Airlines (2006–2008), David Linebaugh of Delta Air Lines (2008–2011), Steve Jones of American Airlines (2011–2013), William Barrett ...
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A hunting blind (US), hide or machan is a concealment device or shelter for hunters or gamekeepers designed to reduce the chance of detection by animals. There are different types of blinds for different situations, such as deer blinds and duck blinds. Some are exceedingly simple, while others are complex. The legality of various kinds of ...
Ground targets further than this range cannot be detected, so the PRF can be quite high; a radar with a PRF of 7.5 kHz will return ambiguous echoes from targets at about 20 km, or over the horizon. If however, the PRF was doubled to 15 kHz, then the ambiguous range is reduced to 10 km and targets beyond this range would only appear on the ...
The United States military unleashed a wave of attacks targeting radar sites operated by Yemen's Houthi rebels over their assaults on shipping in the crucial Red Sea corridor, authorities said ...
Marpa may refer to: Marpa Lotsawa (1012–1097), Tibetan Buddhist teacher credited with the transmission of many Buddhist teachings to Tibet from India; Marpa, Peru, ruins of a pre-Columbian town located along the Cotahuasi Canyon in the Andes range of southern Peru; MARPA, Modification and Replacement Parts Association; Mini-automatic radar ...
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