8.3Usercalibration—i40Depth
Calibrationproceduresaredependantoninstrument
displayvariant.
Usercalibrationoptionsinclude:
•Depthdisplayresponse—Dictatestherateat
whichtheinstrumentdisplayrespondstochanges
indepthdata.
•*Unitsfordepthreadings—Assignstheunitof
measureusedfordepthrelatedreadings.
•*Depthoffset—Assignsanoffsettothedepth
reading.
•*Shallowalarmlock—LockstheShallowalarm.
Note:*Thesesettingsareonlyavailableonunits
whentheinstrumentstatussettoMaster(see
IntermediateCalibrationfordetailsofchangingthe
displaytobeMasterorRepeater).
DepthOffset
Depthsaremeasuredfromthetransducertothesea
bed,butyoucanapplyanoffsetvaluetothedepth
data,sothatthedisplayeddepthreadingrepresents
thedepthtotheseabedfromeitherthekeelorthe
waterline.
Beforeattemptingtosetawaterlineorkeel
offset,ndouttheverticalseparationbetweenthe
transducerandeitherthewaterlineorthebottomof
thekeelonyourvessel,asappropriate.Thensetthe
appropriatedepthoffsetvalue.
1
Waterlineoffset
2
Transducer/Zerooffset
3
Keeloffset
Ifanoffsetisnotapplied,displayeddepthreadings
representthedistancefromthetransducertothe
seabed.
Calibratingdepth
Tocalibrateyouri40Depthfollowthestepsbelow.
Duringnormaloperation:
1.SimultaneouslypressandholdtheDownand
Actionbuttonsfor2secondstodisplaytheUser
Calibrationpage.
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2.PresstheActionbuttontodisplaytheDepth
Responsepage.
3.UsetheUpandDownbuttonstoadjustthe
DepthResponsetotherequiredlevel.
Thedefaultlevelis12.Thelevelsavailableare1
to15withlevel1beingtheslowestupdaterate
andlevel15thequickest.
4.PresstheActionbuttontodisplaytheDepth
unitspage.
5.UsetheUpandDownbuttonstoselectthe
requiredunitofmeasurementfordepthreadings.
Theunitsofmeasureavailablefordepthreadings
are:
•FT—feet(default)
•M—Meters
•FA—Fathoms
6.PresstheActionbuttontodisplaytheDepth
Offsetpage.
7.UsetheUpandDownbuttonstoselectthe
requireddepthoffsetvalue.
Thedepthoffsetcanbesettothefollowing
values:
•Keel—valuesbetween–9.9to–0.1
•OFST(zerooffset)(default)—0.0
•W/L(Waterline)—valuesbetween0.1to9.9
8.PresstheActionbuttontodisplaytheShallow
AlarmLockpage.
9.UsetheUpandDownbuttonstoswitchthe
shallowalarmlockonandoff.
WiththeShallowAlarmLockOnyoucannot
changethealarmthresholdorswitchthealarm
onandoff.Tochangethealarmthresholdor
switchthealarmonandoffthealarmlockmust
besettoOff(default).
10.T osaveyoursettingsandreturntonormal
operationfromanypage,simultaneouslypress
andholdtheDownandActionbuttonsfor2
seconds.
i40Depth
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