Simrad ST90 - Verifying the Installation Parameters for the Transducer

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Verifyingtheinstallationparametersforthe
transducer
Whentheinstallationtrunkismounted,itmaynotbepositionedwiththemountingholes
perfectlyalignedtothecentrelineofthevessel.Whenthehullunitisplacedonthe
trunk,the"forward"markonthetransducershaftsleeve-andthusalso"forward"on
thetransducer-maynotpointforwardatall,butseveraldegreesoffthecentreline.To
obtainaccurateST90presentations,thismisalignmentmustbeadjustedbychangingthe
installationparameters.
Prerequisites
Foraccuratelocationofthe
transducer,youneedthedetailed
vesseldrawings.Youalsoneedthe
alignmentanglethatwasrecorded
whenthehullunitwasinstalled.
Neithertoolsnorinstrumentsare
required.TheST90systemisturned
onandoperatesnormally.
Illustration:
ABow
BThisisthealignmentangle.
C0°transducermark
Context
Independentofthehullunit
orientation,thealignmentisalways
denedas:
Theanglemeasuredclockwise
from
thebowtothe0degreestransducermark.
The0°transducermarkislocatedoutermostonthemountingange,anditismarkedas
ared"0".Dependingonthetransducermounting,itcanbelocatedatanyangleonthe
mountingange,notnecessarilyasshownintheillustration.
Procedure
1OpentheSetupmenu.
2OntheSetupmenu,selectInstallation.
ObservethattheInstallationdialogboxopens.Thisdialogboxcontainsanumber
ofpagesselectedfromthemenuontheleftside.
Verifyingtheinstallationparameters