The muster list is a critical, high-fidelity safety document required on all commercial vessels, including cruise ships, under the International Convention for the Safety of Life at Sea (SOLAS). The three primary pieces of information found on a muster list are: 1. The Emergency Signal, which describes the specific sound pattern (usually seven short blasts followed by one long blast on the ship's whistle) used to alert passengers and crew to an emergency. 2. Assigned Duties, which detail the specific responsibilities of every crew member, such as lowering lifeboats, guiding passengers to exits, or fighting fires. 3. The Muster Station Location, which identifies the exact designated area where passengers and crew must gather to prepare for evacuation or receive instructions. Beyond these three, the list also includes instructions on how to properly don a lifejacket and the specific procedures for closing watertight doors and fire valves. For passengers in 2026, the digital version of this information is often pushed to their smartphone app or stateroom television, but the physical muster list posted on the back of the cabin door remains the official legal reference for emergency preparedness at sea.