On Wed, 13 Sep 2006 00:00:02 +0100, "Capt. Scumbalino"
wrote:

Ellen MacArthur wrote:

How come? You got it wrong too when in your other post you
talked about one of the boats being overtaken.

I see you people need a hint: Subtract the angles. Does the
result fit the definition of overtake?

A vessel shall be deemed to be overtaking when coming up with another vessel
from a direction more than 22.5 degrees abaft her beam, ...

You have described the course that each vessel is on, the subtraction of one
from the other being 28 degrees - but this doesn't pertain to the direction
from the beam of the vessel being overtaken. You didn't define their
positions, only their courses, and stated that their courses look like they
will converge (which, for colreg purposes, is close enough to be considered
a potential collision situation).

"The one catching up is going on a course of 180 degrees" If they are
to converge "the direction from the beam of the vessel being
overtaken" must be less than 28 degrees.

So, we have a boat on 208deg, and another (catching up on the first) on
180deg, with a convergence point ahead if they maintain these courses.
Whether the catching boat is 22.5deg abaft of the other boat's beam is
unknown - they could be on a collision course, or not, depending on their
positions. See...

http://sports.webshots.com/photo/826...48327613VRqQxV

In the left-hand diagram, the green boat is overtaking the red one, but it
isn't in the right-hand diagram because it's ahead of the green one's
imaginary line representing 22.5deg abaft her beam. Until you define their
positions, it cannot be said for sure that the situation is an overtaking
one.

In lieu of that, I would say that the windward boat has to keep clear.