A milestone in the ongoing development of human culture:
A: "I have a diver down; keep well clear at slow speed."
B: "I am taking in or discharging or carrying dangerous goods."
A: "Keep clear of me; I am maneuvering with difficulty."
B: "I require a tug."
A: "I am altering my course to starboard."
B: "I am on fire and have dangerous cargo on board: keep well clear of me."
A: "I am leaking dangerous cargo."
B: "I wish to communicate with you."
A: "You should stop your vessel instantly."
B: "My nets have come fast upon an obstruction."
A: "My vessel is 'healthy' and I request free pratique."
B: "Keep clear of me; I am engaged in pair trawling."
A: "Stop carrying out your intentions and watch for my signals."