Simrad SU90 - Page 154

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•BottomFilterThreshold
TheSU90providesabottomltertoreducethesometimespowerfulechofromthe
seabed.Thislterisusefulifyoutrytondshclosetothebottom.SelectaBottom
FilterThresholdvaluetocontrolthe"strength"ofthelter.Ahighernumerical
increasesthelterefciencyandreducesthebottomechoaccordingly.
•NoiseFilter
TheNoiseFilterremovesunwantedacousticnoisefromtheSU90presentation.It
reducestheinterferencefromotheracousticsystems(sonarsandechosounders),
aswellasthenoisefromthepropellers.
•HorizontalScroll
TheHorizontalScrollfunctioncontrolshowfasttheechopresentationshallmove
fromrighttowardsleftintheEchogramview.The"speed"iscontrolledbyadjusting
thenumberofpixelsusedtopresenteachping.Ahigherspeedreducestheresolution.
•VerticalReference
ThefunctionisonlyavailableintheV erticalview,aswellastheverticalNavigation
view.
SimradSU90OperatorManual