SimradES70
Example10StartRangeandRangeinbottomrelatedechogram
Inabottomechogram,settheStartRangevalueto–5meters.Thiswillmakethe
echogramstartfrom5metersabovethebottom.SetRangetothe5metersplus
10=15meters.Theechogramwillnowshowtheareafrom5metersabovethe
depth,anddownto10meters“below”thebottom.Thebottomcontourwillappear
asaatline.
ThebiomasscalculationismadeinthesamewayasforSurfaceechograms.
Relatedtopics
•StartRangeonpage160
•Rangeonpage158
•CalculationIntervalonpage192
•Echogramonpage220
Pelagicechogram
Thepelagicechogramappearsverysimilartothesurfaceechogram.However,the
biomasscalculationsarenotlimitedbythebottomdetection.
Example11StartRangeinapelagicechogram
Inapelagicechogram,settheStartRangevalueto20meters.Thiswillmakethe
echogramstartfrom20metersbelowtheseasurface(providedthatthetransducer
offsethasbeendened).SetRangeto40meters.Theechogramwillnowshow
theareafrom20metersbelowtheseasurface,anddownto60metersbelowthe
transducer.Providedthatthedepthislargerthan60meters,thebottomcontour
isnotshown.
Thebiomasscalculationsarenotrestrictedbythebottomdetection.Thismeansthatthe
bottomechowillbeincludedincalculationsifitappearswithinthechosenrange.
Relatedtopics
•StartRangeonpage160
•Rangeonpage158
•CalculationIntervalonpage192
•Echogramonpage220
Trawlechogram
Theechogramcoverstheverticalopeningofthetrawlwithreferencetothedepthof
theheadrope.
Inadditiontothetrawlopening,theechogramcoversacertainrangeoverandunderthe
trawlopening.ThisrangeissetbyadjustingtheRangeandStartRangeparameters.
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