Raymarine a67 - Page 39

i.e.:MinimumSafeDepth=MaximumVesselDraft
+SafetyMargin.
D13159-1
2
4
1
3
1.Waterline
2.MaximumVesselDraft
3.SafetyMargin
4.MinimumSafeDepth
Important:Theinformationbelowisprovided
forguidanceonlyandisnotexhaustive.Some
inuencingfactorscanbeuniquetocertainvessels
and/orareasofwaterandmaynotbelisted
below.YoushouldensureyouaccountforALL
factorsthatapplytoyourcurrentsituationwhen
makingcalculations.
Someofthefactorsthatcaninuencehowmucha
vesseldrawsareshownbelow:
•Vesseldisplacement(weight)—Avessel’sdraft
willincreasewhenitisfullyladenwhencompared
withitsunladendisplacement.
•Watertype—Avessel’sdraftwillincreaseby
approximately2%to3%infreshwatercompared
toseawater.
Someofthefactorsthatshouldbetakenintoaccount
whencalculatingaSafetyMarginare:
•Vesselmaneuveringcharacteristics—A
vessel’sdraftincreasesduetosquat,trim,roll,
pitchandheave.
•Chartaccuracy—Theelectronicchartdepth
maynotbeaccurateorthetruedepthmayhave
changedsincethelastsurvey.
•Weatherconditions—Highairpressure,and
prevailingwindstrengthanddirectioncanaffect
waveheight.
Minimumsafebeam
AspartoftheInitialstartupwizardtheMinimum
SafeBeamvaluecanbeset.Minimumsafebeamis
requiredwhenusingJeppesen
®
EasyRouting..
MinimumSafeBeamcanbeestablishedbyadding
together:
•MaximumVesselWidth(Beam)
•SafetyMargin(anadequateclearancetoeither
sideofthevessel.)
i.e.:MinimumSafeBeam=PortSafetyMargin+
Beam+StarboardSafetyMargin.
D1322-1
2
1
3
1.Portsafetymargin
2.MaximumVesselWidth(Beam)
3.Starboardsafetymargin
Important:Theinformationbelowisprovided
forguidanceonlyandisnotexhaustive.Some
inuencingfactorscanbeuniquetocertainvessels
and/orareasofwaterandmaynotbelisted
below.YoushouldensureyouaccountforALL
factorsthatapplytoyourcurrentsituationwhen
makingcalculations.
Someofthefactorsthatshouldbetakenintoaccount
whencalculatingaSafetyMarginare:
•Vesselmaneuveringcharacteristics—A
vessel’srequiredclearancewillincreasedueto
roll.
•Chartaccuracy—Theelectronicchartdatamay
notbeaccurateormayhavechangedsincelast
surveyed.
Minimumsafeheight
AspartoftheInitialstartupwizardtheMinimum
SafeHeightvaluecanbeset.Minimumsafeheight
isrequiredwhenusingJeppesen
®
EasyRouting..
MinimumSafeHeightcanbeestablishedbyadding
together:
•Maximumvesselheightfromwaterline
•SafetyMargin(anadequateclearanceabovethe
vesseltoaccountfortideandweathereffects.)
i.e.:MinimumSafeHeight=MaximumVessel
Height+SafetyMargin.
1
2
3
D13323-1
1.SafetyMargin
2.Maximumheightfromwaterline
3.Waterline
Gettingstarted
39