GMDSS: Element 7

1. A Stations not directly involved with the on-going Distress communications may not transmit on the Distress frequency or channel.
2. B Stations remaining off the air to safeguard proprietary information.
3. C Two three-minute silent periods, at 15 and 45 minutes after the hour, that provide a transmitting "window" for Distressed vessels to transmit Distress alerts using J3E.
4. D Communications on a Distress frequency or channel is banned for 24 hours following the cessation of the Distress traffic.

Tip: press A-D to answer