What is diver down flag?

The diver down flag is a signaling device used in recreational diving to indicate the presence of a diver in the water. It typically consists of a red field with a white diagonal stripe running from the top left corner to the bottom right corner.

The diver down flag is used to signal to other vessels in the area that there are divers in the water, and that caution should be taken to avoid them. In many jurisdictions, displaying a diver down flag is a legal requirement when there are divers in the water.

It is important to note that the diver down flag does not guarantee the safety of divers, and they should still take precautions to ensure their own safety while in the water. Additionally, divers should be aware of and follow any local regulations regarding the use of diver down flags.