Doug,

Pardon me if I sound argumentative. I'm not trying to be.

7/12 isn't the way I figure the Tides. I use the RMS and the 12 hour
cycle. I round the 707 to 70%. This leaves 30% for the curve at the top
and bottom and since we are only thinking of a 1/2 sine wave 15% on the
top and 15% on the bottom. So, .15x12=1.8 hours from the middle of
Slack Tide, 8.4 hours max flow, 1.8 to Slack again (1.8+8.4+1.8=12 hour
Tide Run)

That leaves only (g) the problem of Mid Slack.This I think is where we
start to lay the blame on the Tide Tables. There can be HW by sight for
at least an hour. I really don't know how to find this mid point and an
hour difference at a inlet can be the difference of passage or no.

Allow time and be early. I let my boat "Lady Bug" until the right time.

Ole Thom