On Thu, 16 Oct 2008 16:30:48 -0400, "Wilbur Hubbard"
wrote:

(ii) such risk may sometimes exist even when an appreciable bearing change
is evident, particularly when approaching a very large vessel or a tow or
when approaching a vessel at close range.

This is an important point. With an approaching large vessel you
could take a bearing on the bow and get a changing angle, same on the
stern with the angle changing in the opposite direction. The end
result would be a collision amidships.