Scott Vernon wrote:
Isn't 7/12s 'about halfway'?

look it up.

Not when it's Nav-math.

And otnmbrd's post is really to the point... general rules are nice, but
every location is a special case and will trump most of the general
rules.

One of the most frustrating things around here is that the tide tables
are usually in error by at least half an hour. The tidal current in
Snow's Cut (for example) is very strong, and so far I have yet to see it
run on schedule. It's annoying after planning a departure at an
inconvenient time so as to arrive at slack, only to find the current
running like a champ with no sign of slacking.

Fresh Breezes- Doug King