What is the standard signal for a boat that requires assistance?

The standard signal for a boat that requires assistance is displaying an orange distress flag. This flag is widely recognized as a universal symbol of distress on the water, alerting other vessels and authorities that assistance is needed. In maritime signaling, the orange distress flag is an effective and clear method to convey an emergency situation, especially in conditions where visual signals might be more easily noticed.

While other options may provide signals for various situations, they do not serve specifically as a universally accepted distress signal. For example, while shining a bright light can attract attention at night, it is not a standardized distress signal. Waving both arms above the head can indicate a general call for help but lacks the specific recognition associated with the orange distress flag. Similarly, three long blasts of a horn can indicate various situations depending on the context, but this also does not specifically signify that a vessel is in distress. The use of the orange flag is vital for enhancing safety on the water by clearly communicating the need for help.