Which department on a ship is primarily responsible for navigation?

The navigation department is primarily responsible for ensuring that the ship is safely and accurately maneuvered through waterways. This department focuses on charting courses, monitoring navigational equipment, and communicating with other vessels and maritime authorities. Personnel in the navigation department, such as the Officer of the Deck (OOD) and quartermasters, are trained in celestial navigation, radar use, and understanding of various navigational rules and regulations. Their expertise is crucial for the safe passage of the ship, especially when operating in congested or hazardous waters.

In contrast, other departments like engineering and combat systems have distinct roles. The engineering department manages the ship's propulsion and power systems, while the combat systems department focuses on the operational readiness and employment of weapon systems. The operations department oversees broader mission planning and execution, which may include navigation but does not solely encompass it as a primary responsibility. Thus, the navigation department is the unequivocal authority on all navigational matters aboard the ship.