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?

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."

If there already exists enough room, then it's fine. If there is not,
the boat must have the right to get it.

DSK