What does the blue and white "alpha" flag signify?

The blue and white "alpha" flag specifically indicates that a dive boat is in the area and is restricted in its ability to maneuver. This flag is crucial for ensuring safety on the water, as it advises other vessels to keep a safe distance from the dive site and be cautious of divers that may be entering or exiting the water. When boaters see this flag, they understand that there may be divers in the vicinity, which helps to prevent accidents and protect those diving below the surface. This is why recognizing and understanding the meaning of the alpha flag is essential for all boaters and helps maintain safety standards on the water.