What is the Mayday VHF channel?

Channel 16 is designated as the international distress, safety, and calling frequency. It is the primary VHF channel used for emergency communications, including Mayday calls, which indicate a vessel's life-threatening situation. Mariners are required to monitor this channel at all times while underway, as it is the channel that facilitates immediate assistance from other vessels and shore stations. This makes it essential for ensuring swift and coordinated emergency responses.

The other channels listed do not serve the same purpose. Channel 12 is often used for intership communications, while Channel 14 is commonly designated for government communications in certain areas. Channel 20, on the other hand, is used for port operations and may not be monitored for emergencies. Thus, Channel 16's specific assignment for distress signaling is why it is the correct answer.