Simrad ST90 - Defining the Middle Position of the Transducer

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2OntheSetupmenu,selectInstallation.
ObservethattheInstallationdialogboxopens.Thisdialogboxcontainsanumber
ofpagesselectedfromthemenuontheleftside.
3OntheleftsideoftheInstallationdialogbox,selectHullUnitCongurationto
openthepage.
4Selectwhichtypeofhullunitthathasbeeninstalled.
5Atthebottomofthepage,selectApplytosaveyoursettings.
6ContinueyourworkintheInstallationdialogbox,orselectOKtocloseit.
Furtherrequirements
ThechoicesyoumakeontheHullUnitCongurationpagearevitalforallST90
operation.Youmustonlymakethesechoicesonce.Accidentalchangestothehullunit
settingsmaycausedamagetoyourST90.
Relatedtopics
Settingtoworksummary,page242
ConguringtheST90fornormaloperation,page307
Deningthemiddlepositionofthetransducer
ThehullunitprovidedwiththeST90isdesignedtolowerthetransducerdownbelow
theship’shullwhentheST90shallbeused.WhentheST90isswitchedoff,the
transducerishoistedforprotection.TheST90allowsyoutodeneamiddleposition
forthetransducer.
Prerequisites
Thephysicalpropertiesofthehullunitinstallationareknown.
Thecorrecttypeofhullunitisselected.
Thevesselisberthedoratsea.
Context
Themiddlepositionisnotaxedlength.Thephysicalmiddlepositiondependson
whichtypeofhullunityouareusingwiththeST90.
RetractingthetransducertoamiddlepositionmaybeusefulifyouusetheST90
simultaneouslywithothersonars.Ahigherpositionwillpermityoutoincreasethe
vesselspeed.Ifyouoperateinveryshallowwaters,youmayalsoreducetherisk
ofhittingbottom.However,placingthetransducerimmediatelyunderthehullmay
increasetheownoise.
SimradST90InstallationManual