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NMEA SIGNALS (NMEA 0183 STANDAARD (definieert voor 4800-baud seriële…

- - - - talkers
      - both
      - listeners
    - - baud rate: 4800 characters / sec
      - number of data bits: 8
      - stop bits: 1
      - parity: none
      - handshake: none
  - - - talker sentence
        
        $ ttsss,d1,d2,... <CR><LF>
        
        tt = talker identifier
        
        sss = sentence identifier
        
        d1,d2, ... = number of datafields (followed by optional checksum)
      - proprietary sentence
        
        start: $P
        
        followed by manufacturer ID
        
        followed by data the manufacturer wishes (following general format of standard sentence
      - query sentences
        
        listener requests particular sentence from talker
        
        $tt ll Q,sss,<CR><LF>
        
        tt = talker identifier of requester
        
        ll = talker identifier of the adressed device
        
        Q = defining message as query
        
        sss = identification of sentence being requested
  - - - GGA
        
        data for GPS reciever:
        
        time
        
        position
        
        fix
        
        provides:
        
        3D location
        
        accuracy data
        
        consists of:
        
        time [UTC]
        
        Latitude with N/S indicator
        
        longitude (with E/W indicator)
        
        GPS quality indicator
        
        0 - fix not available
        
        1 - GPS fix
        
        2 - differential GPS fix
        
        3 - PPS fix
        
        4 - real time kinemati fix
        
        5 - float RTK
        
        6 - estimated (Dead Reckoning)
        
        7 - manual input mode
        
        8 - simulation mode
        
        Numer of satellites in view (0-12)
        
        horizontal dilution of precision
        
        antenna altitude
        
        units of antenna altitude
        
        geoidal seperation
        
        units of geoidal separation
        
        age of dfferential GPS data
        
        differential reference station
        
        checksum
      - GLL
        
        lat./lon. vessel, time of fix and status
        
        consists of:
        
        latitude (with N/S indicator
        
        longitude (with E/W indicator)
        
        UTC of position
        
        Status:
        
        A = valid
        
        only in A or D modes
        
        V = not valid
        
        mode indicator
        
        A = autonomous
        
        D = differential
        
        E = Estimated (Dead reckoning)
        
        M = manual input
        
        S = simulator
        
        N = data not valid
        
        = supplement of status field
- - - - message identifier assignments
      - device classification codes