Raymarine P70 - Page 4

ii.SelectSet-up.
iii.SelectAutopilotCalibration.
iv.SelectDriveSettings.
v.SelectHardOverTime.
vi.Usethe+10button(p70)orROTARYcontrol(p70r)to
specifythehard-overtime.
STEP 5
Compasslinearization
WithEvolutionautopilotsystems,whentheEVunitisrst
installedandpowered-up,itsinternalcompassneedsto
compensateforlocalmagneticvariationsandtheearth’s
magneticeld.Thisisachievedusinganautomaticprocess
knownaslinearization,whichformsanimportantpartofthe
autopilotinstallation,commissioningandset-upprocess.
Linearization
InEvolutionsystems,thelinearizationprocessisperformed
automaticallybytheEVunitasabackgroundtaskoncethe
vessel'sspeedexceeds3knots,andnouserinterventionis
required.Theprocesswilloccurduringyourrstvoyagewith
theautopilotsystem,andwilltypicallytakenomorethan30
minutes,butthisdoesvaryaccordingtothecharacteristicsof
thevessel,theinstallationenvironmentoftheEVunit,and
thelevelsofmagneticinterferenceatthetimeofconducting
theprocess.Sourcesofsignicantmagneticinterferencemay
increasethetimerequiredtocompletethelinearizationprocess.
Examplesofsuchsourcesinclude:
•Marinepontoons.
•Metal-hulledvessels.
•Underseacables.
Note:Youcanspeed-upthelinearizationprocessby
completinga360degreeturn(ataspeedof3–15knots).
Youcanalsorestartthelinearizationprocessatanytimeby
selectingtheRestartCompassmenuitem.
Usethecompassdeviationindicator
Theuseofthecompassdeviationindicatoronthepilotcontrol
headmaybeusefulinthisprocess,particularlyiftheEVunithas
beeninstalledinalocationonthevesselwherethelevelsof
magneticinterferencearetoohighfortheEVunittocompensate
appropriately.Ifthisisthecase,thedeviationdisplaywillindicate
avalueof25degreesorhigher.Inthisscenario,Raymarine
highlyrecommendsthattheEVunitismovedandre-installedin
alocationwhichissubjecttolessmagneticinterference.If“--”
isdisplayedastheDeviationvalue,itmeansthatlinearization
hasnotbeensuccessfullycompletedyet.
Checkthecompassheadingdata
Aspartoftheautopilotsystemcommissioningprocess,
Raymarinerecommendsthatyoucheckthecompassheading
valuedisplayedonyourautopilotcontrolheadormultifunction
display,againstagoodknownheadingsourceonvarious
headings.ThiswillhelpyoutodeterminewhentheEVunithas
completeditslinearizationprocess.
Note:Oncethelinearizationprocesshascompleted,itis
possiblethattheheadingvaluemayhaveaslightoffsetof2to
3degrees.Thisiscommonwhereinstallationspaceislimited,
andtheEVunitcannotbeproperlyalignedtothevessel's
longitudinalaxis.Inthiscase,itispossibletomanuallyadjust
thecompassoffsetvalueusingthepilotcontrolheador
multifunctiondisplay,andne-tunetheheadingtoanaccurate
value.
Note:DoNOTrelyontheheadingaccuracyuntilyouare
satisedthatcompasslinearizationandalignmentiscomplete.
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.
STEP 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