Raymarine AIS 350 - Page 19

wasspecicallyintendedtoallowforawholenetworkofmarine
electronicsfromanymanufacturertocommunicateonacommon
busviastandardizedmessagetypesandformats.
NMEA0183
TheNMEA0183DataInterfaceStandardwasdevelopedby
theNationalMarineElectronicsAssociationofAmerica.Itisan
internationalstandardtoenableequipmentfrommanydifferent
manufacturerstobeconnectedtogetherandshareinformation.
TheNMEA0183standardcarriessimilarinformationtoSeaT alk.
Howeverithastheimportantdifferencethatonecablewillonly
carryinformationinonedirection.ForthisreasonNMEA0183is
generallyusedtoconnectadatareceiverandatransmittertogether,
e.g.acompasssensortransmittingheadingtoaradardisplay.This
informationispassedin‘sentences’,eachofwhichhasathree
lettersentenceidentier.Itisthereforeimportantwhenchecking
compatibilitybetweenitemsthatthesamesentenceidentiersare
usedsomeexamplesofwhichare:
•VTG-carriesCourseandSpeedOverGrounddata.
•GLL-carrieslatitudeandlongitude.
•DBT-carrieswaterdepth.
•MWV-carriesrelativewindangleandwindspeeddata.
Documentandproductinformation
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