A lookout can leave his station __________.

A lookout can leave their station only when properly relieved. This means that the lookout must remain in position until someone else takes over the responsibility. The purpose of having a lookout is to ensure constant vigilance and safety on board, especially during navigation or other critical operations.

Proper relief of a lookout is essential because it maintains continuous observation of the surroundings, helping to prevent accidents or collisions. If a lookout were to leave their station at any other time, it could create a gap in monitoring, leading to hazardous situations. This strict protocol reinforces the importance of teamwork and communication in maritime operations, ensuring that safety standards are upheld consistently.