Regulation 2

The master of every United Kingdom ship, on meeting with dangerous ice, a dangerous derelict or any other direct danger to navigation, or a tropical storm, or on encountering subfreezing air temperatures associated with gale force winds causing severe ice accretion on the superstructure of ships, or winds of force 10 or above on the Beaufort Scale for which no storm warning has been received, shall send, by all means of communication at his disposal, information relating to the matters set forth in Merchant Shipping Notice No. M. 1641/NW1.

Such information shall be sent to the appropriate shore-based authorities via a coast station, as listed in the Admiralty List of Radio Signals Volume 1, and shall be repeated to ships in the vicinity as practicable.

Such information shall be sent on the authority of the master of the ship in English, or by means of the International Code of Signals. Where the information is being transmitted by radio messages, it may be sent in one of the working languages of the International Telecommunication Union and, where language difficulties are encountered, the IMO Standard Communication Phrases should be used.

Such information, when sent on the authority of the master of the ship by means of radio, shall be preceded by the safety signal or code sequence, as prescribed by the Radio Regulations, and shall be in a format permitted under those Regulations.