A few years ago an Isle of Man ferry actually embossed the company's logo on Douglas harbour wall. The event was reported on Manx radio, by a reporter who could actually see the incident from the his studio. The ferry company's first reaction was to deny it had happened.
There may be some more generic lessons there
Bit of an eye opener that the ship's master was going full bore with an estimated metre or so under the keel.
Even more interesting is the annex ( 12 was it?) showing the limits of credibility for survey data - ie even the best is not worth trusting much.
Last month I was doing a bit of fancy navigation over some rocky patches. I got a lot less daring when I went downstairs to look at the date of the survey - 1812. We live and learn.