What is the distinction of a mayday call from other distress signals?

A mayday call is a internationally recognized distress signal that indicates an urgent need for assistance due to a life-threatening emergency at sea. This signal is used when a vessel is in immediate danger, such as sinking, a fire on board, or a person overboard. The term 'mayday' itself is derived from the French phrase "venez m'aider," meaning "come help me."

In contrast, other distress signals, such as safety or urgency calls (like a pan-pan), are used for situations that require assistance but do not involve imminent danger to life or vessel. The distinction lies in the severity of the emergency, with a mayday call signaling a critical situation requiring immediate response from others in the vicinity and emergency services. This is why the correct answer emphasizes the urgent need for assistance inherent in a mayday call.