What does a square yellow flag indicate when displayed from a vessel?

When displayed from a vessel, a square yellow flag indicates that there is a diver in the water nearby. This signal is crucial for ensuring the safety of divers who may be under the water and indicates to other boaters to exercise caution in the area. It alerts nearby vessels to keep clear and to be vigilant, as boat traffic can pose significant risks to divers.

This practice is part of safe boating protocols designed to protect both divers and the vessels in the water, fostering awareness of the potential hazards associated with diving activities. Understanding this flag’s meaning helps ensure that all water users are informed and promote a safer boating environment.