Papa

All persons should report on board – or Preceding to sea – or My nets have come fast upon an obstruction.

Oscar

Man Overboard

Means “No.”

My vessel is stopped and making no way through the water.

You should stop your vessel instantly.

I wish to communicate with you.

I am on fire and have dangerous cargo on board: Keep well clear of me.

I am altering my course to port. (I am turning left.)

I have a pilot on board.

I need a pilot.