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One short blast of the horn tells another boater that you wish them to pass on your left side.
Two short horn blast from a vessel means that she is turning port and one short horn blast that she is turning starboard
You could 'toot' your horn...
Toot
toot
It means "I am altering my course to starboard"
"I am about to turn to starboard".
three short blast
That you are crossing starboard to starboard or overtaking to port side. (you are passing on YOUR starboard side)
One short blast of a horn mean while boating may mean a couple of things depending on where you are. Some of the meanings of the short blast include request for drawbridge to open, intention to pass of the left side and intention to change course to starboard among others.
passing on port side
there is a dangerous situation