A marine public address (PA) and general alarm (GA) system is a critical safety and communication system mandated for all commercial vessels. Its primary function is to broadcast clear announcements and emit emergency alarm signals throughout all accommodation, working, and machinery spaces. Designed to withstand harsh maritime environments, it features robust construction for corrosion resistance, water resistance, and reliable operation under extreme temperatures and vibration. Modern systems are often integrated with the ship's navigation bridge for central control and may include zones, backup power, and interfaces with other onboard systems to ensure effective crew communication and passenger safety in all operational conditions.