What is required of a ship station which has established initial contact with another station on 218kHz or Ch-16?

• A. The stations must change to an authorized working frequency for the transmission of messages
• B. They must continue on 218kHz
• C. They must switch to Channel 13 for all messages
• D. They must cease transmissions until authorized

Answer: (A)

When a dialogue starts on a calling frequency, you don’t keep using that same channel for the entire conversation. After establishing initial contact on a calling frequency, you both move to an authorized working frequency that’s designated for actual message traffic. This keeps the calling channel clear for others to make contact and uses the proper channel for routine communications. So the correct action is to switch to a working frequency for transmitting the messages. The other options would either clog the calling channel, stop transmissions unnecessarily, or lock you into a specific channel that isn’t universally required for all messages.