radar data plotting board

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• Automatic Radar Plotting Aid — A maritime radar with Automatic Radar Plotting Aid (ARPA) capability can create tracks using radar contacts. The system can calculate the tracked object s course, speed and closest point of approach (CPA), thereby knowing if there is a danger of… …   Wikipedia

• History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …   Wikipedia

• Rangekeeper — Rangekeepers were electromechanical fire control computers used primarily during the early part of the 20th century. They were sophisticated analog computers whose development reached its zenith following World War II, specifically the Computer… …   Wikipedia

• Operations room — Plan position indicator (PPI) display showing polar display and radar sweep. A real radar display would show hard terrain features and look recognizably map like, and from the sea, match well with land features of local nautical charts matching… …   Wikipedia

• Mathematical discussion of rangekeeping — In naval gunnery, when long range guns became available, an enemy ship would move some distance after the shells were fired. It became necessary to figure out where the enemy ship, the target, was going to be when the shells arrived. The process… …   Wikipedia

• Dates of 2004 — ▪ 2005 January It turns out we were all wrong, probably, in my judgment. David Kay, former U.S. chief weapons inspector in Iraq, in testimony to the U.S. Senate Armed Services Committee, January 28 January 1              Haitian Pres. Jean… …   Universalium

• geology — /jee ol euh jee/, n., pl. geologies. 1. the science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is… …   Universalium

• SS Andrea Doria — was an ocean liner for the Italian Line (Società di navigazione Italia) home ported in Genoa, Italy. Named after the 16th century Genoese admiral Andrea Doria, the Andrea Doria had a gross tonnage of 29,100 and a capacity of about 1,200… …   Wikipedia

• plot — i. A visual display (e.g., on radar, of an aerial object at a particular time). See plotting board. ii. The portion of a map or an overlay showing outlines of areas covered by reconnaissance or survey photographs. iii. A graphical construction of …   Aviation dictionary

• Royal Observer Corps — Ensign Active 1925–1996 Country …   Wikipedia

• surveying — /seuhr vay ing/, n. 1. the science or scientific method of making surveys of land. 2. the occupation of one who makes land surveys. 3. the act of one who surveys: The surveying required nearly two days. [1425 75; late ME: act of examining… …   Universalium