What is a common signal for a boater in distress?

A common signal for a boater in distress includes all the options listed. When boaters find themselves in trouble, they use various signals to attract attention and communicate their need for assistance.

Waving arms above the head is a universally recognized signal for distress. This action is effective in letting others on the water or nearby land know that someone is in trouble and requires help.

Flashing lights on the boat serves a similar purpose, especially during low visibility conditions or at night. The light signals can catch the attention of nearby vessels, increasing the chances of a timely response from other boaters or rescuers.

Sounding the horn continuously is another method used to signal distress. The repetitive sound can alert other boaters nearby that someone is in need of assistance. This technique is particularly useful in conditions where visual signals may not be easily seen.

By utilizing a combination of these methods, a boater enhances their chances of being noticed and helped, which is why the correct answer encompasses all the provided options.