@reneestephen
I know 1 or 2 honks are "I'm turning/passing to port/starboard" - except, rather importantly, I can never remember which is which lol.
I remember 5 as being rather politely termed something like "your intentions are unclear" - the restraint is almost palpable... everybody knows it really means "what the hell are you doing?!"
The Isle of Wight ferries in the Solent were famous for collecting yachts - the waters there are solid in boats and the ferries don't hang around.