What is the meaning of Reserve Source of Energy?

• A. A spare generator for the ship's propulsion
• B. A back-up battery for cabin lighting
• C. The supply of electrical energy sufficient to operate the radio installations for distress and safety communications in the event of failure of the ship's main and emergency sources of electrical power.
• D. Fuel for emergency lifeboat engines

Answer: (C)

The idea being tested is that a Reserve Source of Energy is a dedicated backup power supply focused on keeping the ship’s radio equipment alive for distress and safety communications when the main and emergency power sources fail. This means energy storage or an independent power source is available specifically to operate the radio installations so Mayday and other safety transmissions can still be sent even if the ship loses its primary power. It isn’t about providing propulsion power, cabin lighting, or fuel for lifeboats, but about maintaining critical communication capability during power outages. In practice, this reserve ensures that distress signaling and safety communications remain possible until power is restored or help arrives.