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What are vessels 20m and over required to have for sound-signalling?

  1. One sound-signalling device

  2. Two sound-signalling devices or appliances

  3. A VHF radio only

  4. A loudspeaker system

The correct answer is: Two sound-signalling devices or appliances

Vessels 20m and over are required to have two sound-signalling devices or appliances for signaling purposes. A single sound-signalling device may not be sufficient for larger vessels and a loudspeaker system is not considered a proper sound-signalling device. A VHF radio may have a speaker but is primarily used for communication and not for sound signalling.