I have a diver in the sea. It is used in the sense of finding a good net in a heavy way.

It is used to mean that I am loading, unloading or carrying dangerous cargo.

Yes (Positive). It is used to mean that the meaning of the previous group should be read possitively.

Please be clear from me, it is used to mean that I have difficulty in manuevering.

It is used to mean that I am changing my route to starboard.

It is used to mean that I do not have the ability to move, please contact me.

It is used to mean I want a guide. It means 'I'm Collecting My Nets fishing in areas close to the fishing grounds.

There is a guide on board.

It is used to mean that I am changing my route to the pier.

I'm on fire and there's a dangerous cargo on board. It is used to mean stay well away from me and clear.

It is used to mean that they want to communicate with you.

It is used to mean stop your ship immediately.

It is used to mean that my ship has stopped and I cannot make way.

No. It is used in the meaning that the negative or the meaning of the previous group should be read as negative.

It is used to mean that a man fell into the sea.

IN PORT: The ship is about to go out to sea. It is used to mean everybody should be on the ship. AT SEA: Used by fishing vessels. It means "My nets got caught in an obstacle".

It is used to mean that the ship is in good health, I want free practice.

It is used to mean replenishment or material transport at sea.

My machines are used in the sense of working astern.

Please be open to me. It is used to mean that I am pulling a double trovl (trolling). 

It is used to mean that you are going to danger.

It is used to mean they want help.

It is used to mean I want medical help.

It is used to mean stop your attempt and wait for my signal.

It is used to mean that I am scanning my anchor.

It is used to mean I want a tugboat. If taken by fishing ships, it means "I'm Casting My Nets".