Simrad ST90 - Page 381

442703/B
379
Context
Themotionreferenceunit(MRU)measurestherollandpitchmotionsofthevessel.
Somesensormodelsalsomeasureheave.
OntheMRUpage,youmustdenethephysicallocationofthemotionreferenceunit
relatedtothereferencepointyoucreatedontheShippage.TherotationaroundtheX,Y
andZaxisisusedtocompensateformisalignmentsmadeduringthephysicalinstallation
ofthemotionreferenceunit.Suchmisalignmentsoccurifthesensorisnotplacedin
parallelwiththevessel’shorizontaland/orverticalplanes.Therequiredaccuracyofthe
offsetandrotationanglesdependsontheaccuracyrequirementfortheST90data.
Procedure
1OpentheSetupmenu.
2OntheSetupmenu,selectInstallation.
ObservethattheInstallationdialogboxopens.Thisdialogboxcontainsanumber
ofpagesselectedfromthemenuontheleftside.
3OntheleftsideoftheInstallationdialogbox,selectthesmallwhitetrianglenextto
InstallationParameters.
Observethatamenuopenswithaccesstoalltheindividualpages.
4SelectMRUtoopenthepage.
aFromthevesseldrawings,extracttherelevantoffsetinformation,andinsert
thosevalues.
bFromtheinformationprovidedbythepersonnelinstallingthemotionsensor,
obtaintherelevantrotationinformation.
cMakesurethatthecorrectoffsetvalueshavebeeninserted.
dMakesurethatthecorrectinstallationangleshavebeeninserted.
eRecordtheinformationintheresulttable.
Note
TheKongsbergSeapath
®
-andotherGPSsystems-allowyoutodenetheMRU
locationinthepositioningsystem.Ifthisisdone,theMRUoffsetvaluesintheST90
mustbesetto0(zero)toavoid"dualcompensation".Therotationinformationis
normallynotrecordedbythepositioningsystem,andmustthereforebedened
intheST90.
5SelectCanceltoclosethedialogboxwithoutmakinganychanges.
Settingtowork