Installation manual

SimradES70
Example18StartRangeinasurfacerelatedechogram
Inasurfaceechogram,settheStartRangevalueto0meters.Thiswillmakethe
echogramstartfromtheseasurface(providedthatthetransduceroffsethasbeen
dened).SetRangetothecurrentdepthplus20meters.Theechogramwillnow
showtheareafromtheseasurfaceanddownto20meters“below”thebottom.
Thebottomcontouriseasilydetectedwhenthedepthchanges.
Example19StartRangeinasurfaceechogram
Inasurfaceechogram,settheStartRangevalueto10meters.Thiswillmakethe
echogramstartfrom10metersbelowtheseasurface(providedthatthetransducer
offsethasbeendened).SetRangetothecurrentdepthplus20meters.The
echogramwillnowshowtheareafrom10metersbelowtheseasurface,anddown
to10meters“below”thebottom.Thebottomcontouriseasilydetectedwhen
thedepthchanges.
Example20StartRangeinapelagicechogram
Inapelagicechogram,settheStartRangevalueto20meters.Thiswillmakethe
echogramstartfrom20metersbelowtheseasurface(providedthatthetransducer
offsethasbeendened).SetRangeto40meters.Theechogramwillnowshow
theareafrom20metersbelowtheseasurface,anddownto60metersbelowthe
transducer.Providedthatthedepthislargerthan60meters,thebottomcontour
isnotshown.
Lowerechogram:Bottomrelated(bottomexpansion)
Themajorityofourusersprefertousethelowerechogram(B)forbottomexpansion.
Thisisthedefaultsetting.
Whenyouusebottomexpansion,thewatersurfaceisnotthereferenceanylonger,but
thebottomis.Itisalways0.Thatmeansthatthebottominthisechogramwillalwaysbe
at,eventhoughitmayvaryintheupperechogram.Tochooseaverticaldepthrangefor
thebottomexpansion,setRangetoapositivevalue.Thisisthetotalverticalrangeof
theechogram.Then,setStartRangetoanegativevalue.Thisistheechogram'sstart
heightabovethebottom.Inthisechogrampositivedepthisbelowthebottom,while
negativedepthisabove.
Typicalsettingsmaybe:
•Range=15m
•Startrange=–10m
Thisprovidesyouwitha15metershighphasedareastartingat10metersabovethe
bottomto5metersbelowit.
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