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Deck: Rules of the Road

Question 272 of 1,025

BOTH INTERNATIONAL & INLAND You are on a vessel heading due south and see the lights shown in illustration D051RR below, one point on the port bow. What direction could this vessel be heading?

USCG illustration D051RR for Deck Rules of the Road question 272
Illustration D051RR
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tricky

Mariner discussion

Comments from mariners who studied this question.

dc dcreasoner · Sep 30, 2015
although it seems the green would be to the right of the whites.
mi mitchpadl · Mar 15, 2019
Don't get this one. Sure seems like it would be moving SW
Mi Mike123asd5 · Apr 24, 2019
She should be heading south west!
go golivi · Apr 27, 2019
The posted answer is correct...draw it out. You are heading 180 degrees and the contact bears 169 degrees (given that it is one point to port). You will only see the contact's green sidelight if he is heading straight at you (his heading of 349 degrees) or through a 112.5 degree arc to 236.5 degrees. The only choice in this range is NW or 315 degrees. IF the contact were indeed heading SW (225 degrees) she would have a starboard 124 degree angle on the bow, and would therefore be showing her stern light to you, not her sidelight.