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5.EnterthisestimateasyourHardOverTime.TheHardOver
timesettingcanbeaccessedfromtheDriveSettingsmenu:
Menu>Set-up>AutopilotCalibration>DriveSettings>
HardOverTime.
6.AftersettingyourHardOverTime,observeyourautopilot’s
behaviorandifrequired,makesmalladjustmentstotheHard
OverTimevalueuntilasatisfactoryresultisachieved.
5
Compasslinearization
WithEvolutionautopilotsystems,whentheEVunitisrstinstalled
andpowered-up,itsinternalcompassneedstocompensatefor
localmagneticvariationsandtheearth’smagneticeld.This
isachievedusinganautomaticprocessknownaslinearization,
whichformsanimportantpartoftheautopilotinstallation,
commissioningandset-upprocess.
Linearization
InEvolutionsystems,thelinearizationprocessisperformed
automaticallybytheEVunitasabackgroundtaskwhenthe
vessel'sspeedisbetween3and15knots,nouserintervention
isrequiredhoweveratleasta270degreeturnisrequired.The
processwilloccurduringyourrstvoyagewiththeautopilot
system,andwilltypicallytakenomorethan30minutes,butthis
doesvaryaccordingtothecharacteristicsofthevessel,the
installationenvironmentoftheEVunit,andthelevelsofmagnetic
interferenceatthetimeofconductingtheprocess.Sourcesof
signicantmagneticinterferencemayincreasethetimerequired
tocompletethelinearizationprocess.Examplesofsuchsources
include:
Marinepontoons.
Metal-hulledvessels.
Underseacables.
Note:Youcanspeed-upthelinearizationprocessby
completinga360degreeturn(ataspeedof315knots).
Youcanalsorestartthelinearizationprocessatanytimeby
selectingtheRestartCompassmenuitem.
Usethecompassdeviationindicator
Theuseofthecompassdeviationindicatoronthepilotcontrol
headmaybeusefulinthisprocess,particularlyiftheEVunithas
beeninstalledinalocationonthevesselwherethelevelsof
magneticinterferencearetoohighfortheEVunittocompensate
appropriately.Ifthisisthecase,thedeviationdisplaywillindicate
avalueof25degreesorhigher.Inthisscenario,Raymarine
highlyrecommendsthattheEVunitismovedandre-installedina
locationwhichissubjecttolessmagneticinterference.If“--”is
displayedastheDeviationvalue,itmeansthatlinearizationhas
notbeensuccessfullycompletedyet.
Checkthecompassheadingdata
Aspartoftheautopilotsystemcommissioningprocess,
Raymarinerecommendsthatyoucheckthecompassheading
valuedisplayedonyourautopilotcontrolheadormultifunction
display,againstagoodknownheadingsourceonvarious
headings.ThiswillhelpyoutodeterminewhentheEVunithas
completeditslinearizationprocess.
Note:Oncethelinearizationprocesshascompleted,itis
possiblethattheheadingvaluemayhaveaslightoffsetof
2to3degrees.Thisiscommonwhereinstallationspaceis
limited,andtheEVunitcannotbeproperlyalignedtothe
vessel'slongitudinalaxis.Inthiscase,itispossibletomanually
adjustthecompassoffsetvalueusingthepilotcontrolheador
multifunctiondisplay,andne-tunetheheadingtoanaccurate
value.
Note:DoNOTrelyontheheadingaccuracyuntilyouare
satisedthatcompasslinearizationandalignmentiscomplete.
Systemmonitoringandadaptation
Toensureoptimumperformance,aftertheinitiallinearization
processiscompletetheEVcontinuestomonitorandadaptthe
compasslinearizationtosuitcurrentconditions.
Iftheconditionsforlinearizationarelessthanideal,theautomatic
linearizationprocesstemporarilypausesuntilconditionsimprove
again.Thefollowingconditionscancausethelinearization
processtotemporarilypause:
Boatspeedislessthan3knots.
Boatspeedisgreaterthan15knots.
Rate-of-turnistooslow.
Signicantexternalmagneticinterferenceispresent.
Accessingthecompassdeviationindicator
1.SelectMENU.
2.SelectSet-up.
3.SelectDiagnostics.
4.SelectAboutPilot.
Thedetailsrelatedtothepilotdiagnosticsaredisplayed.
5.Scrolldowntothebottomofthelisttoviewtheentryfor
Deviation.
Note:If“--”isdisplayedastheDeviationvalue,itmeansthat
linearizationhasnotbeensuccessfullycompletedyet.
Adjustingthecompassoffset
WiththepilotinStandby:
1.SelectMENU.
2.SelectSet-up.
3.SelectAutopilotCalibration.
4.SelectVesselSettings.
5.SelectCompassOffset.
6.Usethe+/-10button(p70)orROTARYcontrol(p70r)to
adjustthecompassoffsetasappropriate.
6
Compasslock
Onceyouaresatisedwiththecompassaccuracy,youcanlock
thesettingtopreventtheautopilotsystemfromcompletinga
furtherautomaticlinearizationinthefuture.
Thisfeatureisparticularlyusefulforvesselsinenvironmentsthat
areexposedtostrongmagneticdisturbancesonaregularbasis
(suchasoffshorewindfarmsorverybusyrivers,forexample).
InthesesituationsitmaybedesirabletousetheCompasslock
featuretodisablethecontinuouslinearizationprocess,asthe
magneticinterferencemaybuildaheadingerrorovertime.
Note:Thecompasslockmaybereleasedatanytime,to
allowthecompasscontinuouslinearizationtorestart.This
isparticularlyusefulifplanningalongvoyage.Theearth’s
magneticeldwillchangesignicantlyfromonegeographical
locationtoanother,andthecompasscancontinuously
compensateforthechanges,ensuringyoumaintainaccurate
headingdatathroughoutthevoyage.
4
Evolutionautopilotset-upandcommissioningwithp70/p70R
4


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