User manual

SimradES70
bBottom
Theechogramisrelatedtothedetectedbottom.Stopdepth(lowerechogram
boundary)andverticalrangearemanuallyselectedbytheStartDepthand
RangebuttonsontheMainmenu.Theechogramisonlydrawnforpingshaving
asuccessfulbottomdetection.
ThebiomasscalculationismadeinthesamewayasforSurfaceechograms.
cPelagic
ThisechogramisnearlyidenticaltotheSurfaceechogram.However,the
biomassiscalculatedinadifferentmanner.
Thebiomasscalculationsarenotrestrictedbythebottomdetection.This
meansthatthebottomechowillbeincludedincalculationsifitappearswithin
thechosenrange.
Example24Biomasscalculation
Ifyouareinvestigatingalargeschoolofpelagicsh,settheStartRange
andRangetoenclosetheschool.Iftheschoolislargeenough,aSurface
echogrammaymistakeitforbottom,andthebiomassreadingswill
bewrong.ThePelagicechogramwillhoweverdisregardthebottom
detection,andgiveacorrectestimateofthebiomass.
dTrawl
Thisechogramcoverstheverticalopeningofthetrawl.
Theechogramisonlydrawnwhentrawlpositioninformationisavailable.
→Trawlonpage200
ThebiomasscalculationismadeinthesamewayasforSurfaceechograms.
3BottomTVG
UsethiseldtosetuptheTVGforthebottomdetector.
4UserTVG
UsethisspinboxtodeneyourownTVGcurve.
Note
Forthischoicetotakeeffect,theTVGtypemustbesetto“User”.
5Applytoall
Clickthisoptionifyouwishtoimplementyourchangestoalltheechograms
presentlyinuseontheES70.
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