Raymarine i50 Depth - Page 60

1pointspeedcalibration
Theinstrumentdisplay’sspeedreadingscanbe
calibratedusinga1pointcalibrationprocess,inmost
situationthisisallthatwillberequiredtocalibrate
ourspeedreadings.
Prerequisites:
•ForbestresultsSOGdatashouldbeavailable,or
analternativemethodofestimatingvesselspeed
mustbeused(e.g.vesselspeedcanbeestimated
usingNauticalMeasuredMileMarkersorsimilar
landmarksofaknowndistanceapart).
•Youwillneedtobeunderway,withsufcientspace
tomaneuverunhindered.
•Inordertoachieveaccurateresults,water
conditionsmustbecalmwithzerotideandzero
current.
FromtheUserCalibrationMenu:
1.Steeryourvesselonasteadycourseata
constanttypicalspeed.
2.PresstheSpeedbuttonuntil1oftheCurrent
Speedpagesisdisplayed(4pressesfromthe
UserCalibrationentrypage).
IfSOGdataisavailableoverSeaT alk
ng
then
theSOGpageisdisplayed,ifSOGdataisnot
availablethentheCalibrationFactorpageis
displayed.
D12445-2
SOG
SOG
Spe e d
Spe e d
3.IftheSOGpageisdisplayedandthewater
conditionsareacceptable,pressandholdthe
Resetbuttonforapproximately3secondsto
acceptSOGasthecurrentlogspeed.
D12447-2
Re s e t
10
15
20
25
30
35
40
45
50
55
60
5
3
4.Alternatively,withtheCalibrationFactorpage
displayedusetheTripandResetbuttonsto
adjustthecalibrationfactoruntilthedisplayed
speedmatchesyourestimatedspeed.
Thedefaultcalibrationfactoris1.00.The
calibrationfactorcanbesetfrom0.25to2.50.
5.IfSOGisavailableyoucanswitchbetweenthe
CalibrationFactorandSOGpagesbypressing
theTripandResetbuttonsatthesametime.
D12446-2
+
Trip
Re s e t
Note:ToexittheUserCalibrationpagesatany
time,pressandholdtheDepthandSpeedbuttons
atthesametimeforapproximately2seconds.
Nauticalmeasuredmilemarkers
WhenneitherSOGdataoranyotherreliablemeans
ofestimatingSpeedThroughtheWater(STW)is
available,NauticalMeasuredMileMarkerscan
beusedtohelpcalibrateLogSpeed.Nautical
measuredmilemarkersareidentiedbytwopairsof
postsortowers.Thedistancebetweeneachpairof
markersis1nauticalmile.
Eachmarkerinapairisseparatedbydistanceand
elevationfromitspartner.Thefrontmarkeriscloser
tothewaterandshorterthanthemarkerbehindit.
Markers—sideview
D13147-1
1
2
1.Frontmarker
2.Rearmarker
Whenthe2markersappearverticallyaligned
thevesselisonthecorrectrangelinetobegina
measuredmilerun.
Markeralignment
D13148-1
1 2 3
1.Leftofrangeline
2.Onrangeline
3.Rightofrangeline
Thevesselshouldalreadybeattopspeedandas
therstpairofmarkersappearalignedastopwatch
shouldbestarted,whenthevesselpassesthe
secondpairofalignedmarkersthestopwatchis
stopped.
Measuringanauticalmile
5
4
D13149-1
3
1
2
1.Startingpoint(startstopwatch)
2.Measuredmile
60i50