What daytime signal do vessels engaged in mine clearing display?

Vessels that are engaged in mine clearing operations display three black balls arranged in a triangle during daytime. This signal is part of the International Regulations for Preventing Collisions at Sea (COLREGs), which specify various day shapes and signals for different types of marine activities. The triangular arrangement of the three black balls clearly indicates that the vessel is involved in mine clearance, allowing other vessels to recognize the nature of its activity and navigate accordingly.

The use of three black balls ensures visibility and provides a distinctive signal, helping to prevent collisions and ensure safety on the water by alerting nearby vessels to keep a safe distance. Understanding these signals is crucial for maintaining awareness of different vessels' operations and ensuring maritime safety.