Raymarine LIGHTHOUSE 4 - Page 192

2.2
nd
—ThesecondInterceptionzone(displayedfarthestfromthetarget
vessel)representsthetargetvesselrunningyoudownfrombehind.
Whenalteringcourseandspeed,bothInterceptionzonesmustbeavoided.
Scenario2Coursechangee
xamples
1.CoursealterationtopassaheadoftheInterceptionzone[Not
recommended]—Asthetargetvesselismovingfasterthanyourvessel
youwillpassasternofthetarget.
2.CoursealterationtopassaheadofthefirstInterceptionzone[Not
recommended]—Althoughthiscoursealterationissufficienttoavoida
potentialbow-to-bowcollision,ithascreatedasecondInterceptionzone
wherethetargetmaynowrunyoudownfrombehind.
3.Coursealterationtopassbetweenthe2Interceptionzones[Not
recommended]—Althoughthismayseemlik
ethequickestoption,
proceedwithcaution,asthegapbetweenthe2Interceptionzonescan
closequickly,especiallywhenyourvesselslowsdown.
4.CoursealterationtoclearasternofthetargetvesselanditsInterception
zone.Thiswouldbethepreferredmanoeuvreasitcorrectlyaltersyour
vessel’scoursesothatitisclearofthetarget’sInterceptionzone,and
passessafelyasternofthetarget.Thismanoeuvrealsoclearlyindicates
tothetargetvesselyourchangeofcourse.
Figure2.Scenario2Speedchangeexamples
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