Flag A Alpha Size 3 2 X 2 (Int Diver Down) Signal H & G

The Alpha A flag is 2 feet by 2 feet (size 3) nylon with heading and grommets. While recreational boaters and divers use the poppy-red flag with one diagonal white stripe to indicate that a diver is in the water, the official International Code of Signals message for "diver down" is the blue-and-white swallowtail A (Alpha). It is used to tell other boats to keep clear at a low speed.