1. Every radiotelephone set carried on board a vessel or floating establishment shall conform to, and shall be operated in accordance with, the requirements of the competent authorities.
2. Motorized vessels, excluding small craft, ferry-boats and floating equipment may sail only if they are equipped with two radiotelephone installations in proper working order. When under way, the radiotelephone installations for the ship-to-ship and nautical information channels must be permanently in a ready-to-transmit and ready-to-receive state. The channel allocated to nautical information may only be left for a short time in order to transmit or receive information on other channels.
3. Ferry-boats and motorized floating equipment may only sail if they are equipped with a radiotelephone installation in proper working order. When under way, the radiotelephone installation for the ship-to-ship channel must be permanently in a ready to-transmit and ready to receive state. This channel may only be left for a short time in order to transmit or receive information on other channels. The first and the second sentence shall also apply during operation.
4. Each vessel equipped with a radiotelephone installation shall make reports on the channel allocated to the ship-to-ship network before entering blind sections, narrow channels or bridge openings and the sections determined by the competent authorities.
5. Sign B.11 (annex 7) shall indicate that the competent authority requires the use of radiotelephone communications.