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381292/C

Thechallengeistondatiltthatpreventstheshechoestobe"buried"inreverberation

andbottomechoes.

•Ifyouuseahightiltvalue(A)theshareeasilydisguisedbybottomechoes.A

strongRCG(ReverberationControlledGain)settingwillremovethebottomechoes.

Asthedistancefromthebottomtotheshincreases,theshechoesbecomeclearer.

However,thisassumesthattheshechoesareconsiderablystrongerthanthebottom

echoes.

•Ifyouuseaverysmalltilt(C)youarenotbotheredbybottomechoes.However,ifthe

seasurfaceisgustyyouwillseeechoesfromthewaves.Theseechoesarenormally

ratherweak,andtheyhardlymoveinrelationtoyourvessel.

•Bymeansofamediumtiltangle(B)youareabletopickupscatteredshorschools

ifthesearelocatedatsomedistanceabovethebottom.Theupperschoolinthe

illustrationappearsonthesonarpicturebeforethebottomecho,whilethelower

schoolwilleasilybedisguisedbythebottomechoes.Onceagainyoucanactivatethe

RCGfunctiontoimprovethereading.

Tip

WiththevariousbeamsprovidedbytheSU90,itmaybedifculttounderstand

theconcept.Howdothesebeams"behave"inthewater?Bymeansofagraphic

presentation,theBeamVisualizationdialogboxattemptstogiveyouabetter

understandingofhowtheacousticbeamsaretransmittedintothewater .OpentheBeam

VisualizationdialogboxfromtheSetupmenu.

Procedure

1Clickinanyviewtomakeitactive.

Theactiveviewisidentiedwithathickerborder.UnlessyouusetheApplytoall

function,allchangesyoumakewillonlybeappliedtothisview.

2InaV erticalview,clickonthetiltline,keepthemousebuttondepressed,anddrag

thelineupordown.

Optionally:

3ObservetheMainmenu.

ItsdefaultlocationisontherightsideoftheSU90presentation.

Gettingstarted

Simrad SU90 Quick Start Guide

Other manuals for Simrad SU90