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Direction finding antenna near the city of Lucerne, Switzerland. Direction finding ( DF ), or radio direction finding ( RDF ), is the use of radio waves to determine the direction to a radio source. The source may be a cooperating radio transmitter or may be an inadvertant source, a naturally-occurring radio source, or an illicit or enemy system.
Harpoon missiles. Phalanx CIWS. USS Belknap (DLG-26/CG-26), named for Rear Admirals George E. Belknap (1832–1903) and his son Reginald Rowan Belknap (1871–1959), was the lead ship of her class of guided missile cruisers in the United States Navy. She was launched in 1963 as DLG-26, a guided missile frigate under the then-current designation ...
The drift angle (shaded red) is due to the wind velocity (W/V, in green). In navigation, the heading of a vessel or aircraft is the compass direction in which the craft's bow or nose is pointed. Note that the heading may not necessarily be the direction that the vehicle actually travels, which is known as its course or track.
Direction determination. Direction determination refers to the ways in which a cardinal direction or compass point can be determined in navigation and wayfinding. The most direct method is using a compass ( magnetic compass or gyrocompass ), but indirect methods exist, based on the Sun path (unaided or by using a watch or sundial ), the stars ...
Course (navigation) Instruments used to plot a course on a nautical chart. In navigation, the course of a watercraft or aircraft is the cardinal direction in which the craft is to be steered. The course is to be distinguished from the heading, which is the direction where the watercraft's bow or the aircraft's nose is pointed. [ 1][ 2][ 3]
Package tracking. Package tracking or package logging is the process of localizing shipping containers, mail and parcel post at different points of time during sorting, warehousing, and package delivery to verify their provenance and to predict and aid delivery. Package tracking developed historically because it provided customers information ...
MarineTraffic is a maritime analytics provider, [ 1] which provides real-time information on the movements of ships and the current location of ships in harbors and ports. [ 2] A database of information on the vessels includes for example details of the location where they were built plus dimensions of the vessels, gross tonnage and ...
The four cardinal directions, or cardinal points, are the four main compass directions: north, south, east, and west, commonly denoted by their initials N, S, E, and W respectively. Relative to north, the directions east, south, and west are at 90 degree intervals in the clockwise direction. The ordinal directions (also called the intercardinal ...