Thats just for small boats.
I have run the bosperous strait, which in itself was no sweat, but 1/2 a day after coming out in the MED going west at night, some oncoming dumbass on our STB side, decided to change to port just before we met.
i think you are supposed to pass port/port in that situation, but really he shouls have stayed where he was and that would have been just fine, instead he almost caused a many many ton collision.
That was damn close, and the Navigator threw a fit grabbed signal lamp and morse code ASSHOLE strait into the bridge of the other ship. and really we was so close you could just have yelled it and they would have heard it.
Its the only time i have seen a naval officer loose it like that.