Simrad ES80 - Page 428

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•Fish(40logR)
Thisgainsettingprovideslargeramplicationclosertothebottom.Ithasbeen
designedtoprovidethebestechoesfromsinglesh.
•Targets(40logR)
ThissettingusesthesameTVGamplicationasFish(40logR),butadditional
lteringandcompensationisimplemented.
Onlyechoesdetectedandinterpretedassingleshareshown.Theechoesare
compensatedfortheirphysicalpositioninthebeam(beamcompensation).
Thismeansthatshintheouterregionofthebeamareadjustedtocorrectsize
eventhoughtheirechoesareweaker.
Note
ThisTVGsettingonlyworkswithsplitbeamtransducers.
•TargetMix(40logR)
ThissettingusesthesameTVGamplicationasFish(40logR),butadditional
beamcompensationisimplemented.Echoesdetectedandinterpretedassingle
shareadjustedtotheircorrectsizeaccordingtotheirphysicalpositionin
thebeam.
Note
ThisTVGsettingonlyworkswithsplitbeamtransducers.
•User
ThissettingallowsyoutodeneyourownTVGsetting.Tochooseyourown
TVGcurve,usethededicatedfunctionintheEchogramdialogbox.
EchogramType
Usethisfunctiontoselectwhatkindofechogramyouwishtoseeinthecurrent
("active")view.
•Surface
ASurfaceechogramismainlyusedwhenyouwishtolookattheentirewater
columnstartingfromtheseasurfaceanddowntothebottom.Sincethis
echogramisreferencedtotheseasurface,thebottomcontourwillvarywiththe
actualdepth.IfyousetuptheStartRangeandRangedepthstoplacethebottom
contouratthelowerendoftheechogram,youwillhavegoodopportunityto
studytheechoesfromthewatercolumn.
Inthesurfaceechogram,allcalculationsaremadefromtheseasurfaceand
downtothedetectedbottom.Usethisechogramtypetoobtaincorrect
calculationofthebiomass.ItwillalsoprovidevaliddatafortheSize
Distributioninformationpane.
SimradES80ReferenceManual