Simrad ST90 - Page 165

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•RCG(ReverberationControlledGain)
TheRCG(ReverberationControlledGain)functionremovesunwantedreverberation
fromthebottomandorfromtheseasurface.Thisenhancesthevisibilityofschools.It
mayhoweveralsoremovescatteredshfromthepresentation.
•BottomFilterThreshold
TheST90providesabottomltertoreducethesometimespowerfulechofromthe
seabed.Thislterisusefulifyoutrytondshclosetothebottom.SelectaBottom
FilterThresholdvaluetocontrolthe"strength"ofthelter.Ahighernumericalincreases
thelterefciencyandreducesthebottomechoaccordingly.
•NoiseFilter
TheNoiseFilterremovesunwantedacousticnoisefromtheST90presentation.Itreduces
theinterferencefromotheracousticsystems(sonarsandechosounders),aswellasthe
noisefromthepropellers.
•HorizontalScroll
TheHorizontalScrollfunctioncontrolshowfasttheechopresentationshallmovefrom
righttowardsleftintheEchogramview.The"speed"iscontrolledbyadjustingthe
numberofpixelsusedtopresenteachping.Ahigherspeedreducestheresolution.
•VerticalReference
ThefunctionisonlyavailableintheVerticalview,aswellastheverticalNavigationview.
Menusystem