[Ifyouwouldprefernottodefinethesearchrectangledimensionsusingthemajorandminoraxis,
therectanglecanbedefinedbysettingthecoordinatesofeachcornerpointinstead]:
i.Enterthecoordinatesofeachcornerpoint1–4.
Note:
•Thecornercoordinatesneedtoformarectangle
.Ifthecoordinatesarenotsuitablethenyou
willnotbeabletocreatethesearchroute.
•TheCSPmustbeononeofthesidesofthesearchpattern.
•ForaCreepingLinesearchpatterntheCSPmustbelocatedalongoneofthelongersides.
•ForaParallelLinesearchpatterntheCSPmustbelocatedalongoneoftheshortersides.
•TheCSPmustbeonabearingofbetween85°to95°(i.e.rightangle±5°)fromthepreviousside.
•TheCSPshouldbehalfatrackwidthfromthecornerpoint.
8. 13Laylines
Laylinesareusedinsailingtoshowhowfarthevesselmustsailonthecurrenttackinordertomake
atargetwaypointaftertacking,givenpresentwindconditions.
Whenalaylineisusedtocalculatetheroutetoawaypoint,itwilltakeintoaccountanumberoffactors
toprovideabetteralternativecourse,comparedtosimplynavigatinginastraightlinetoawaypoint.
Thereasonwhylaylinesareamoreefficientwaytosailtoaspecificpointisbecausethey’re
basedonTrueWindDirection(TWD)andeither:a)fixedupwind/downwindsailingangles,orb)
theuseofpolarstoreflecttheperformanceofyourparticularvessel.Inthisrespect,sailingalong
laylinesmaximizesyourVelocityMadeGood(VMG)towindward.Anotherreasonwhylaylines
aremoreaccurateisbecausetheycanalsobeconfiguredtoaccountfortidalcurrent,aswellas
theleewayofyourvessel.
Toensurethelaylinecalculationsareasaccurateaspossible,it’simportanttoensurethatthe
followingsettingsarecorrectlyconfigured:
•Boatdetails(specificallythoserelatingtosailing): Homescreen>Settings>Boatdetails
•Laylinessettings: Chartapp>Menu>Settings>Laylines
Formoreinformationonthesesettings,referto:p.85—Boatdetails
andp.186—Laylinessettings
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