Installation manual

Echosoundertheory
Example15UsingtheBottomBackstepparameterforatshdetection
Ifyoushforsole,ounderorsimilarspecies,youcanusetheBottom
Backstepparametertoenhancethedetectionofthesh.Increasethebottom
backstepvalue(makeitmorepositive)sothatthebottomisdetectedslightly
deeperthanthecorrectdepth.TheES70willthen“pushthrough”thesh
better,andtheatshwillbeshownastheyarelocated“above”thebottom.
→Howtoadjustthebottomdetectiontondatshonpage91
Aboutrangeselection
Foreveryfrequency(channel)youwishtopresentontheechosounderdisplay,youare
providedwithtwoechograms.
Figure42Rangeselection
A
B
C
D
(CD010217E)
AUpperechogram
(surfacerelated)
BLowerechogram
(bottomrelated)
CScopeviewforupper
echogram
DScopeviewforlower
echogram
Normally,theupper
echogramwillshowthe
entiredepthrangefrom
theseasurfaceanddown
tothebottom,whilethe
lowerechogramshows
abottomexpansion.This
isamagnicationofthe
areajustaboveandbelow
thebottom.
Youarefreetochoose
anypresentationyou
wantinanyofthe
echograms.
Todothis,openthe
Echogramdialogonthe
Activemenu.
343539/B
117