This signal is almost always used by commercial traffic, but its use by
recreational
vessels varies greatly by local custom and the situation.

Some marinas have wirhin their own rules that horns shall not be sounded
except for an emergency situation.

--
katysails
s/v Chanteuse
Kirie Elite 32
http://katysails.tripod.com

"Women and cats will do as they please, and men and dogs should relax
and get used to the idea." - Robert A. Heinlein