I am undergoing a speed trial, became: I have a diver down; keep well clear at slow speed

I am taking in or discharging explosives: became, I am taking in, or discharging, or carrying dangerous goods.

Yes (Affirmative): became, Yes (Affirmative or 'The significance of the previous group should be read in the affirmative').

Keep clear; Maneuvering with difficulty

I am directing my course to starboard: became, I am altering my course to starboard.

Disabled, communicate with me

New additional meaning, made by fishing vessels operating in close proximity on the fishing grounds it means 'I

I have a pilot onboard.

I am directing my course to port: became, I am altering my course to port

I am going to send a message by semaphore: became, I am on fire and have dangerous cargo on board; keep well clear of me

You should stop your vessel instantly became, I wish to communicate with you.

You should stop - I have something important to communicate: became, You should stop your vessel instantly.

I have a doctor on board: became My vessel is stopped and making no way through the water.

No (Negative): became, No (Negative or 'The significance o the previous group should be

Man overboard

In harbour the same. At sea, Your lights are out or burning badly: became, when used by fishing vessels to mean, 'My nets have come fast upon an obstruction'.

Ship does not have disease aboard; it signifies "I request free pratique," which means I ask that the authorities in the port give me a clean bill of health.

The way is off my ship - you may feel your way past me

My engines are going full speed astern: became, My engines are going astern.

Do not pass ahead of me became, Keep clear of me engaged in pair trawling.

You are standing into danger: became, You are running into danger.

I require assistance (not distress).

I require medical assistance.

I require a tug. or, when made by fishing vessels operating in close proximity on the fishing grounds it means, 'I am shooting nets'.

Stop what you're doing and watch for my signals.

I am carrying mails; dragging my anchor