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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).
The first product was a combined marine receiver and direction finder, for yachts and small boats. From there, the company designed and manufactured products for the marine electronics market, including communications receivers, Navtex receivers, radar detectors, transponders and emergency position indicating radio beacons (EPIRBs).
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).
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.
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.
IMO and ITU both require that the DSC-equipped MF/HF and VHF radios be externally connected to a satellite navigation receiver (GPS). That connection will ensure accurate location information is sent to a rescue coordination center if a distress alert is transmitted.