Simrad ST90 - Page 43

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Globalpositioningsystem(GPS)
Aglobalpositioningsystem(GPS)mustbeconnectedtotheST90.Whenaglobal
positioningsystem(GPS)connectedtotheST90,thevessel’scurrentgeographical
positioncanbepresentedintheuserinterface.Itwillalsoprovidelatitudeandlongitude
informationforthecursorandmarker(s).Inadditiontonavigationaldata,theglobal
positioningsystem(GPS)canalsobeusedtoprovidespeedinformation.
Note
Mostglobalpositioningsystem(GPS)canprovidecourseinformation,butthisdatais
generallytooinconsistenttoprovideastableST90presentation.
Theglobalpositioningsystem(GPS)interfacerequirementsare:
•Serialline:StandardNMEA0183datagramformats
•Ethernet(LAN)line:StandardNMEA0183datagramformats
Relatedtopics
Scopeofsupply,page32
MotionReferenceUnit(MRU)
Inordertooperatecorrectly,theST90requiresinputfromamotionreferenceunit
(MRU).Bydefault,theST90usesabuilt-inmotionsensor.Itisplacedinsidethe
MotorControlUnit.Forimprovedoperationalaccuracy,anexternalmotionreference
unit(MRU)maybeused.
Note
Withouttheinputfromamotionreferencesensor,theST90willnotbeabletocompensate
forthevesselmovements.ThislackofcompensationwillpreventtheST90from
providingcorrectechoinformation.
TheST90hasbeendesignedtomatchthemotionreferenceunit(MRU)sensors
manufacturedbyKongsbergSeatex.Descriptionsofallavailabletypesareprovidedon
theirwebsite.
•https://www.km.kongsberg.com/seatex
Forthemotionsensorunit(MRU)tocommunicatewiththeST90,itmustsupportthe
followinginterfaceformat:
•KongsbergEMAttitude3000
TheEMAttitude3000isaproprietarydatagramformatcreatedbyKongsberg
Maritimeforusewithdigitalmotionsensors.Itholdsroll,pitch,heaveandheading
information.Thedatagramcontainsa10-bytemessage.
KongsbergMaritimemayprovideasuitablemotionreferenceunit.Consultyourlocal
dealeroragentformoreinformation.
SimradST90