Installation manual

SimradES70
Tip
OntheES70youcanchoosefromseveralechogrampresentations.
aSurface
Theechogramisrelatedtotheseasurface.Startdepth(upperechogramboundary)
andverticalrange(acrossechogram)aremanuallyselectedbytheStartDepthand
RangebuttonsontheMainmenu.
Thebiomassisautomaticallycalculatedbasedonchoicesyoumakeinthe
CalculationIntervaldialog;withinagiventimeframe,adenednumberofpings,or
aportionoftheechogramview.Thedataisthentakenfromanechoareastarting
immediatelyafterthetransmitpulse,andendingjustoverthedetecteddepth.
Ifyouhavelimitedyourverticalrange(usingtheRangeandStartRangesettings),
theresultingareaisusedforthebiomasscalculation.Iftheseabedisclearly
denedwithauniquebottomdetection,thebottomechowillnot
beincludedinthe
calculations.Therefore,ifyouswitchthebottomdetectoroff,thebottomechowill
beincludedinthecalculation.
→Biomassinformationpaneonpage97
bBottom
Theechogramisrelatedtothedetectedbottom.Stopdepth(lowerechogram
boundary)andverticalrangearemanuallyselectedbytheStartDepthandRange
buttonsontheMainmenu.Theechogramisonlydrawnforpingshavinga
successfulbottomdetection.
ThebiomasscalculationismadeinthesamewayasforSurfaceechograms.
cPelagic
ThisechogramisnearlyidenticaltotheSurfaceechogram.However,thebiomassis
calculatedinadifferentmanner.
Thebiomasscalculationsarenotrestrictedbythebottomdetection.Thismeansthat
thebottomechowillbeincludedincalculationsifitappearswithinthechosenrange.
Example5Biomasscalculation
Ifyouareinvestigatingalargeschoolofpelagicsh,settheStartRangeand
Rangetoenclosetheschool.Iftheschoolislargeenough,aSurfaceechogram
maymistakeitforbottom,andthebiomassreadingswillbewrong.The
Pelagicechogramwillhoweverdisregardthebottomdetection,andgivea
correctestimateofthebiomass.
dTrawl
Thisechogramcoverstheverticalopeningofthetrawl.
Theechogramisonlydrawnwhentrawlpositioninformationisavailable.
ThebiomasscalculationismadeinthesamewayasforSurfaceechograms.
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