Radio watches for compulsory radiotelephone stations will include which of the following?

The correct answer is that radio watches for compulsory radiotelephone stations will include VHF channel 16 continuous watch. This frequency is designated as an international distress frequency and is used for emergency communications. All vessels equipped with VHF radiotelephones are required to monitor this channel at all times to ensure they can receive distress calls and assist in emergencies.

VHF channel 16 serves as a standardized channel where any vessel or station can initiate a distress call or communicate safety information. The requirement to monitor VHF channel 16 helps enhance maritime safety by ensuring that all parties are aware of emergencies and can respond quickly.

While VHF channel 22a has specific uses, it is not mandated for continuous watch in emergencies, and 121.5 MHz is primarily used for emergency locator beacons rather than regular maritime communications. Similarly, 500 kHz was historically used for maritime safety and distress communications but has largely been phased out in favor of more modern frequencies like VHF channel 16. Therefore, continuous monitoring of VHF channel 16 is essential for compliance with safety regulations and effective emergency response at sea.