In the event of a loss of GPS, what is a key evaluation the OOD must conduct?

When GPS is lost, reevaluating the navigational picture becomes critically important for the Officer of the Deck (OOD). The navigational picture includes the current position of the vessel, course, speed, and any nearby hazards or checkpoints. Without GPS, the OOD must rely on alternative navigation methods, such as visual references, radar, and dead reckoning, to determine and maintain the vessel's position and course.

By reassessing the navigational picture, the OOD can identify the vessel's location using available tools and methods, ensuring safety and effective navigation. It enables the OOD to make informed decisions regarding maneuvers, setting safe courses, and avoiding potential hazards, which is essential during a loss of electronic navigation systems like GPS. This process is crucial for maintaining situational awareness and ensuring the vessel's safety while operating in potentially complex environments.