Which type of device is required for signaling distress on a boat?

The required device for signaling distress on a boat is a power whistle or an equivalent sound-making device. These devices are essential because they provide a means to alert nearby vessels and rescue teams of your emergency situation. Sound signals, such as those produced by whistles, can travel over distances and be heard in conditions where visual signals might not be effective, like in fog or heavy rain.

While handheld flares are also a common distress signal, they are typically used for visual signaling and are not mentioned as being required in many regulations focused on sound devices. A handheld compass and a GPS device, although useful for navigation, serve entirely different purposes and do not serve as distress signals. Understanding the necessity of a power whistle or its equivalent helps ensure that boaters are prepared to effectively communicate their need for help in a variety of situations while on the water.