Specifications

Sonartheory
Ifyouhavetoomuchgain,youwillseeasonarpicturewithtoomanyechoes.Thisis
becausethelargeamplicationpresentsallkindofnoiseandreverberationthatthe
sonarpicksup.Ifthegainissmallerthenoiseandreverberationwilldisappear,butifit
thegainistoosmalltheshechoesmaydisappearaswell.Inmostcasesyoushould
trywithamediumvalue.
Onthissonar,youcanadjustthehorizontalandverticalgainindependentofeachother.
Thehorizontalgainisusedwhenthesonaroperatesinahorizontalmode,forexample
BowuporTruemotion.Ifyouswitchtoamodewithaverticalview,forexampleTrue
motion/Vertical,yoursonarwillneedadifferentgainsettingforthebeamsdirected
towardsthebottom.
Toadjustthegain,seetherelevantprocedures.
Relatedtopics
•Adjustingtheverticalandhorizontalgainonpage60
WhatisRCG?
RCGmeansReverberationControlledGain.Thisisatwo-dimensionallteringofthe
receivedechoesinordertosuppressunwantedsurfaceandbottomreverberation.
IfyouselectStrong,thebottomechoeswilldisappearaltogetherifthebottomisat,
whileschoolsofshclosetothebottomwillbeeasiertosee.
NotethatscatteredshmaybemoredifculttospotiftheRCGfunctionisactive,as
thesecanbemisinterpretedasreverberation.Itisthereforeimportantthatyouusethe
RCGwithgreatcareifyouraresearchingforscatteredsh.
Tip
WerecommendthattheRCGisactiveallthetime,butbecarefulinthevertical
presentation.TheReverberationControlledGain(RCG)worksbestonsmallschools.
Setting“1”isintendedforschools.Setting“2”ismadeforschoolswithhigherdensity.
Try“3”forschoolsclosetobottom,asthissettingwillalsoreducethebottomechoes.
Ifyouarelookingforscatteredsh,useRCGsetting“4”or“5”.
Settings“6”and“7”arealsointendedforschools,while”8”and“9”canbeusedon
scatteredsh.Thesesettingsusealternativealgorithms.
Abouttilt
Thesonarbeamcanbetiltedverticallyinstepsof1degree,andthechosentiltisshown
onthesonarpicture.At0degreestiltyouwilltransmitthesonarbeaminparallelwith
theseasurface,while60degreestiltwilldirectitalmoststraightdown.
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