How do you indicate if your boat is in distress?

To indicate that your boat is in distress, you can use visual signals such as displaying a bright orange flag or a square flag with a black ball. Additionally, you can use sound signals, such as repeatedly sounding a horn or whistle. If equipped, you can also send a distress signal via radio using the Mayday call on VHF Channel 16, or activate an Emergency Position Indicating Radio Beacon (EPIRB) if available.