What is the fog signal for a powerboat not making way?

The fog signal for a powerboat that is not making way is indicated by two prolonged blasts. This signal is specifically adopted in the International Regulations for Preventing Collisions at Sea (COLREGs) to communicate to other vessels that the boat is at anchor or not making way. The use of two prolonged blasts is a clear way to signal to nearby vessels that your craft is stationary, helping to prevent misunderstandings that may lead to collisions in reduced visibility conditions.

In contrast, the other signals have different meanings: a single prolonged blast warns vessels of a power-driven vessel that is underway or making way, while one short and two long blasts indicate that a vessel is operating in reverse. Two short blasts are used to signal a passing agreement in specific situations. Understanding these signals is crucial for safe navigation and effective communication on the water, particularly in fog or low visibility where visibility is limited.