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  • NMEA Data

    Introduction

    NMEA - National Marine Electronics Association

    Sentences

    Basic Structure

    Sentences start with a leading dollar sign ($) and end with a carriage return/line feed. There is often an asterisk (*) followed by an exclusive OR checksum. Sentence length can be no longer than 80 characters, excluding closing characters.

    AAM

    Waypoint Arrival Alarm

    ALM

    Almanac data

    APA

    Auto Pilot A sentence

    APB

    Auto Pilot B sentence

    BOD

    Bearing Origin to Destination

    BWC

    Bearing using Great Circle route

    DTM

    Datum being used.

    GGA

    Fix information

    GLL

    Lat/Lon data

    GRS

    GPS Range Residuals

    GSA

    Overall Satellite data

    GST

    GPS Pseudorange Noise Statistics

    GSV

    Detailed Satellite data

    MSK

    send control for a beacon receiver

    MSS

    Beacon receiver status information.

    RMA

    recommended Loran data

    RMB

    recommended navigation data for gps

    RMC

    Recommended Minimum Data for GPS

    This is the most commonly used NMEA Sentence. This provides the basic information of Location, Velocity, and Time.

    Structure:

    $GPRMC,<TIME>,<STS>,<LATITUDE>,<LAT_BEARING>,<LONG ITUDE>,<LON_BEARING>,<SPEED>,<TRACK>,<DATE>,<MAG_V AR>,<MAG_VAR_DIR>*<CHECKSUM>

    Definition:
    • $GPRMC - Header
    • <TIME> - Time in HHMMSS format. Zero-filled.
    • <STS> - Status
      • A - Active
      • V - Void
    • <LATITUDE> - Latitude in DDMM.SSSS (Degrees, Minutes, Seconds) format. Zero-Filled.
    • <LAT_BEARING>
      • N - North
      • S - South
    • <LONGITUDE> - Longitude in DDMM.SSSS (Degrees, Minutes, Seconds) format. Zero-Filled.
    • <LON_BEARING>
      • E - East
      • W - West
    • <SPEED> - Speed given in knots in 000.0 format. Zero-filled.
    • <TRACK> - Track angle in degrees true
    • <DATE> - Date given in DDMMYY format
    • <MAG_VAR> - Magnetic Variation
    • <MAG_VAR_DIR> - Direction of Magnetic Variation
    • *<CHECKSUM> - XOR CheckSum

    RTE

    route message

    TRF

    Transit Fix Data

    STN

    Multiple Data ID

    VBW

    dual Ground / Water Spped

    VTG

    Vector track an Speed over the Ground

    WCV

    Waypoint closure velocity (Velocity Made Good)

    WPL

    Waypoint Location information

    XTC

    cross track error

    XTE

    measured cross track error

    ZTG

    Zulu (UTC) time and time to go (to destination)

    ZDA

    Date and Time

    Sources/References

    http://www.gpsinformation.org/dale/nmea.htm
    http://aprs.gids.nl/nmea/
    Play with it, 'til it's broke.
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