The broader context of maritime safety, GMDSS reliability, and emergency power requirements. Understanding these system key concepts, such as reserve power, emergency power, and regulatory expectations, is essential for operators, inspectors, or mariners. Reserve Source of Energy (RSE) is a reserve source of power that is independent of the ship’s main power sources. RSE acts as an emergency power system. Testing of the RSE should be completed within 12 months of the inspection. In case of the main ship power sources’ failure, the RSE should have enough power for distress and safety communications when required.
