NMEA

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NMEA 0183 (or NMEA for short) is a combined electrical and data specification for communication between marine electronics and also, more generally, GPS receivers.

The NMEA 0183 protocol is a means by which marine instruments and also most GPS receivers can communicate with each other. It has been defined by, and is controlled by, the US based [National Marine Electronics Association].

The NMEA 0183 standard uses a simple ASCII, serial communications protocol that defines how data is transmitted in a "sentence" from one "talker" to one or more "listeners". The standard also defines the contents of each sentence (message) type so that all listeners can parse messages accurately:

Each message starting character is a dollar sign.
The next first five characters identify the type of message.
All data fields that follow are comma-delimitted.
The first character that immediately follows the last data field character is an asterisk.
The asterisk is immediately followed by a two-digit checksum.

Example of sentence:

Waypoint Arrival Alarm

$GPAAM,A,A,0.10,N,WPTNME*43

Where:

AAM    Arrival Alarm
A      Arrival circle entered
A      Perpendicular passed
0.10   Circle radius
N      Nautical miles
WPTNME Waypoint name
*43    Checksum data

The new standard, NMEA 2000, accommodates several "talkers" at a higher baud rate, without using a central hub.

The NMEA standard is proprietary and expensive. However, much of it has been reverse-engineered from public sources and is available in references like [this one]. and [this one]

External links

[National Marine Electronics Association]

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NMEA

See also

External links