What is the fog signal for a powerboat underway and making way?

The fog signal for a powerboat underway and making way is one prolonged blast followed by two short blasts. This distinctive sound signal is used to communicate the vessel's status and is established to enhance safety in conditions of reduced visibility, such as fog. The prolonged blast indicates that the vessel is underway, while the two short blasts signify its intention to communicate clearly and convey its presence to other vessels nearby.

Understanding this signal is crucial for navigational safety because it alerts other vessels to the powerboat's operational status, thereby reducing the risk of collisions. In contrast, other signals indicate different statuses; a single prolonged blast is typically used by vessels underway but not making way, while continuous short blasts convey a vessel that is either anchored or stopped.