DSK wrote:
Nav wrote:

I think the answer to 22 is C. I'd say it should not be D because that
would not require a substantial course change...


Oddly enough, that's the answer from the test key... did you peek?


No, peek at what -I thought you said the site gave the answer as "D".

Anyway, when does "substantial" become the object of the rule? You
should not expect a boat with rights (although otherwise burdened) to
forced to sail over an obstruction just because the obstruction is "a
small one."


I think the issue here is safety. Since forcing another to tack may give
a strategic advantage the reason for that call must be legititmate. In
other words, the course change needed to avoid the object is so large
that the boat would really suffer in position. I think the idea is that
a simple little dip or luff to pass a narrow obstruction doesn't cost
much if the action is taken early enough?

Cheers