What are the characteristics of the Reserve Source of Energy under GMDSS?

The correct answer highlights that the Reserve Source of Energy (RSE) must be independent of the ship's electrical system when it is needed to supply power to the GMDSS (Global Maritime Distress and Safety System) equipment. This independence is crucial because, during an emergency situation, the main power supply may fail or be compromised. The RSE ensures that GMDSS equipment, which is vital for communication and distress signaling, remains operational regardless of the ship’s primary power systems.

The requirement for the RSE to operate independently allows for reliable operation of emergency communication systems, which can be life-saving in distress situations at sea. It emphasizes the need for a backup that does not rely on the ship's main electrical systems, thus ensuring that vital rescue communications can be made even if the ship's primary power is unavailable.