HOW IS SHE HEADING? 23S

Diagram 5.—You are in a steamship heading North, wind East,
discuss how the respective sailing vessels in the diagram showing you
their red or green side-lights may be carrying the wind.
When the wind is East the prohibited courses for sailing vessels lie
between N.N E. and S.S.E., 6 points on either side of the direction of
the wind.
The sailing vessels showing a red light on any bearing on the star-
board bow are not restricted and can sail in any direction within the
full 10-point arc of their red 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 green light on my port bow cannot take advant-
age of the full 10-point arc of her green 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
port bow can only be heading S S.E., close-hauled on the port tack.
2. The vessel showing her green light 4 points on my port bow can
only be heading N.N.E., close-hauled on the starboard tack.
3. The vessel showing her green light 6 points on rny port bow can
only head between N.N.E. and N., close-hauled on the starboard tack
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4. The vessel showing her green light on my port beam can only
be heading between KN.E. and N.KW. She may be close-hauled on
the starboard tack, or have the wind a little abaft her starboard beam.
If a sailing v'essel's red light on'my starboard bow does not alter its
bearing there is risk of collision. I" would alter course to starboard
and give 1 short blast*
If a sailing vessel's green light on my port bow does not alter its
bearing there is risk of collision. In this example we are, however, on
slightly converging courses and approaching each other slowly. I
could give 2 blasts, alter bourse to port and pass under her stern; or
if I were close to her and passing I could give 1 blast, alter course to
starboard and when finally passed and clear resume my course.
I would alter course to starboard for the red and green lights ahead
and ,also for the red and green lights 2 points on my port bow.