What is the maximum permissible power output for VHF marine radios under the RRO?

The maximum permissible power output for VHF marine radios under the Restricted Radio Operator (RRO) license is 25 watts. This limit is in place to ensure effective communication while minimizing interference with other radio services. VHF radios are typically used for essential communication, such as distress calls and ship-to-ship communications. Keeping the power output at 25 watts helps maintain the clarity and reliability of these communications while also adhering to regulations that govern radio operation at sea.

Higher power outputs, such as those suggested by other choices, could lead to excessive range that may interfere with other vessels or radio services, which is not desirable for the safety and efficiency of maritime navigation. Therefore, the regulation of power output to a maximum of 25 watts is a carefully considered decision that balances the need for effective communication with the prevention of undue interference.