sailing routes - enkhuizer zeevaartschool · keep clear of biscay! ile d’ouessant should not be...
TRANSCRIPT
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SAILINGROUTES
GZV/ENDORSEMENT
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SETUP
-Low&highpressureareasonearth- Prevailingwinds- Oceancurrents- Hurricaneareas- Dangerousareas- Routeingperarea- UseofPilotchartsandOceanPassages
EZSC.Wassenaar
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CONCEPTS
- Doldrums- Horselatitudes- Tradewinds- Monsoon- Continentalshelf- Intertropicalconvergencyzone
EZSC.Wassenaar
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EZSC.Wassenaar
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Highpressureareasonearth
EZSC.Wassenaar
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EZS2013C.Wassenaar
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Oceancurrents
- Drawingpg105/106- Causedbyprevailingwind- CoursechangedbyCoriolis
EZSC.Wassenaar
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Hurricaneareas
EZSC.Wassenaar
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Routeshuricanes,cyclones,typhoons
EZS2013C.Wassenaar
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Piracyproneareas
EZSC.Wassenaar
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DecreaseinPiracy?
EZSC.Wassenaar
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ROUTING
Generalroutes
EZS2013C.Wassenaar
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NorthAtlantic:Europe-Americas
Westerlies!Directly:Seldompossible.MV’sorfastshipswhenusingprofessionalroutingbureaus!
South:PickupthetradewindsNorth:NorthofLpressurearea (Shortbutcold!!)
EZSC.Wassenaar
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Southern(tradewind)route
LizardPointcourseWSWto10°-12°WestKeepclearofBiscay!Iled’OuessantshouldNotbesighted!Biskay,100fathomline,continentalshelf
EZSC.Wassenaar
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BayofBiscayMakewest!àveeringwindafterpassingcoldfront
EZSC.Wassenaar
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EZS2013C.Wassenaar
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Crossingdoldrumsandequator
Nottoofartotheeast:Doldrumsarealarger!Nottoofartothewest:S-hemisphere:SEtradewindNorthernSummer:South-easttradewindmoreS!NorthernSummer:passbetween17°–19°westNorthernWinter:passbetween24°–29°west
EZSC.Wassenaar
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Verylittlewind
Horselattitudes-SirJamesRoss(descendingofair:H)Doldrums:Risingofair(L)
“Intertropicalconvergencezone”
EZSC.Wassenaar
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South-Atlantic:CapeHorn
EZS2013C.Wassenaar
Easttowest:headSouthfirst!SouthsideL
But….NOTtoofar!Westtoeast:prevailingwinds,stayNorthofL!
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EZS2013C.Wassenaar
67days
1914“EdwardSewall”
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SouthAtlantic:CapeofGoodHope
- Roaringforties,screamingfifties- Agulhascurrent:“freakwaves”,southgoingstream6ktàPrevailingwesterlywind
EZSC.Wassenaar
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Indianocean
Monsoon!Nwinter:NENsummer:SWDifferenceintemperature
EZSC.Wassenaar
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Indianocean
- Inthewinterheadwest,inthesummergoeast
- NEmonsoon4-5bf;SWmonsoon5-7bf- EntranceRedsea8bf!- Suezchannel:not‘sailable’
EZSC.Wassenaar
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PanamacanalPacific:areawithnowind
EZSC.Wassenaar
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Panamacanal
LeavingWestside:firstgosouthbeforeheadingWest
(LeavingEastside:leeshoreCaribiansea
EZSC.Wassenaar
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SouthernPacific
Easttowest:SEtradewindWesttoeast:firstgosouth(westerlies)Atolls:àSunfrombehindandenterwithdaylight.Polaroidshades!àBeawareofstrongcurrents!Differencesinwaterlevelinside-outsideatol
EZSC.Wassenaar
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Mediterranean
Currentgoescounterclockwise!W-Estaysouth(inwinterleeshore,Ngales!)E-Wstaynorth
EZSC.Wassenaar
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PilotChartsAveragesofprevailingwinds,currents,airandsurfacetemperatures,waveheights,icelimits,visibility,pressureandweatherconditionsobtainedfromoceanographicandmeteorologicobservationsovermanydecadesNottobeusedfornavigation!Material:pilotchartscontainingthemonthsFeb/April/May/July/Sept.+10copiesofOceanPassagesoftheWorld EZS2013C.Wassenaar
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EZS2013C.Wassenaar
Generalquestions:1. Explainthemeaningoftheredlines2. Howfarsouthhaveicebergsorgrowlersbeenspottedandinwhichyear?Windroses
1. Whatdoesthelengthoftheshaftofthearrowsmean?2. Whatdoestheamountoffeathersonthearrowindicate?
3. Whatdoesthefigureinthecentreofthewindroseindicate?
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Routeingquestion:• SailingfromBrest(France)toMiami(USA).Planacourseonthemapthatoffersthebestchanceonrunningwinds.AlsouserecommendationsfromtheOceanPassageschapter8.
• WhatarethedisadvantagesofagreatcircleroutefromBresttoMiami?Whichoceancurrentsplayaparthere?
EZS2013C.Wassenaar