Simrad EK15 - Page 221

Functionsanddialogboxes
3MaximumDepth
Thesearchforthebottomechoextendsdowntothisdepthwheneverbottomtrack
islost.Useaslightlylargerdepthvaluethanthedeepestspotyouexpecttovisit
inordertoavoidannoyinglylongpingintervalseverytimebottomtrackislost.A
depthvalueofeither0orlessthantheminimumdepthdisablesthebottomdetector.
Note
Ifyousetmaximumdepthtoavalueidenticalorsmallerthantheminimumvalue,
thebottomdetectionalgorithmwillbedisabled.TheEK15willthennotbeableto
detectthebottomatall,andthedisplayeddepthwillbe0.00m
YoucanenterthedesiredMaximumDepthvaluebydraggingthesliderupordown,
orbymeansofthespinbox.
4BottomBackstep
-50dB
-70dB
-30dB
(CD010217-003)
TheBottomBackstepparameterallowsyouto
manuallymodifywhereonthebottompulsethe
depthshallbedetected.Thesettingdoesnothave
aneffectontheEK15'sabilitytodetectandtrack
thebottom.
aThepeakofthebottompulse
bDefaultbottombacksteplevel
cApproximatebottombacksteplevelforatsh
detection
dApproximatebottombacksteplevelforseagrassdetection
Thebottompulsebasicallyidentiesthebottomdepthjustpriortothepeakofthe
pulse(A).However,thismaynotbethetruebottom.Forexample,ifthebottom
pulseisgeneratedbyarockbottomunderathicklayerofmud,theactualdepthis
slightlyshallower.Forthisreason,theEK15isbydefaultsetuptogiveyouadepth
readingafewmillisecondsbeforethepeakofthepulse.Thisisdonebysettingthe
bottombackstepleveltoadefaultvalueof-50dB(B).
Theactualbottomwillneverappearatthepeakofthebottompulse(A),itwill
alwaysbeslightlybeforethepeak.BychangingtheBottomBackstepparameteryou
canhavethebottomdetectedearlier.Thisfeaturecanforexamplebeusedwhen
youshforatsh,orwhenyouareharvestingseagrass.
5Applytoall
Clickthisboxifyouwishtoimplementyourchangestoalltheechogramspresently
inuseontheEK15.
Relatedprocedures
•Deningmaximumandminimumdepthsonpage72
Relatedtopics
•Activemenu;functionsanddialogsonpage205
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