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NMEA 2000, abbreviated to NMEA2k or N2K and standardized as IEC 61162-3, is a plug-and-play communications standard used for connecting marine sensors and display units within ships and boats. Communication runs at 250 kilobits-per-second and allows any sensor to talk to any display unit or other device compatible with NMEA 2000 protocols.
NMEA 0183 is a combined electrical and data specification for communication between marine electronics such as echo sounder, sonars, anemometer, gyrocompass, autopilot, GPS receivers and many other types of instruments. It has been defined and is controlled by the National Marine Electronics Association (NMEA).
Navman F20. Established by Sir Peter Maire in 1986 as New Zealand-based Talon Technology, Navman (as the company became known in the 1990s) is a GPS systems company providing stand-alone GPS units, OEM GPS modules, GPS software for Palm handhelds and Pocket PCs, automotive navigation systems and navigation systems for use at sea.
In 1956 the 'Homer' receiver was produced, said to be the first transistorised RDF to be made available to the world's leisure marine market. Over the course of the 1950s, B&G, then based in Lymington on the south coast of England, extended its activities into echo sounders and in 1960 produced its first speedometer.
A built in GPS receiver or facility to connect an external GPS receiver so that the user's location may be transmitted automatically along with a distress call. When a DSC radio is bought new the user will get the opportunity to program it with the MMSI number of the ship it is intended to be used on.
These signals are broadcast on marine longwave frequencies, which could be received on existing radiotelephones [further explanation needed] and fed into suitably equipped GPS receivers. Almost all major GPS vendors offered units with DGPS inputs, not only for the USCG signals, but also aviation units on either VHF or commercial AM radio bands.
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