HOW IS SHE HEADING 1 235
Diagram 6.—You are in a ship heading North, wind West, discuss
how the respective sailing vessels in the diagram showing their red or
green side-lights may be carrying the wind.
When the wind is West the prohibited courses for sailing vessels lie
between N.N.W. and S.S.W.
The sailing vessels showing a green light on any bearing on my port
bow are not restricted and can be sailing in any direction within the
full 10-point arc of their green light. They are running free with the
wind either on their port quarter, right aft, or on their starboard quarter
as indicated by the wind arrows.
A vessel showing her red light on my starboard bow cannot take
advantage of the full 10-point arc of her red light as she would then be
heading within 6 points of the wind.
1. The vessel showing both her red and green lights 2 points on my
starboard bow can only be heading S.S.W., close-hauled on the star-
board tack.
2. A vessel showing her red light 4 points on my starboard bow
can only be heading N.N.W., close-hauled on the port tack.
3. A vessel showing her red light 6 points on my starboard bow
can only head between N.N.W. and North, close-hauled on the port
tack.
4. A vessel showing her red light on my starboard beam c$n only
head between N.N.W. and N.N.E. She may be close-hauled on thfc
port tack, or have the wind a little abaft her port beam.
Assuming any one of the sailing vessels' lights shown in the diagram
to keep on the same bearing, there would be risk of collision and I have
to keep clear.
I would, give 2 blasts and alter course to port for a green light on
my port bow.
I would alter course to starboard and give 1 blast, for the red and
green lights right ahead; and also for the red and green 2 points on my
starboard bow. The vessels showing the red lights broad on the bow are
heading more or less in the same direction and we are closing in slowly.
Before risk of collision is imminent I could give 1 blast, alter course to
starboard and go under their stern; or if I were passing very close I
could give 2 blasts, alter course to port and pass ahead of them, resuming
nay course when I was finally passed and clear.