What is the fog signal for a vessel that is underway but stopped?

The correct fog signal for a vessel that is underway but stopped is indeed two long blasts every two minutes. This signal is specifically designed to communicate the status of the vessel to other nearby maritime traffic, particularly in reduced visibility conditions such as fog.

In maritime navigation, sound signals are crucial for prevention of collisions and ensuring safety on the water. The two long blasts every two minutes from a vessel anchor or stopped signify its presence, indicating it is not making way in the water. This helps other vessels to navigate safely around the stationary vessel.

Understanding these signals is essential for safe operation on the water, especially in conditions where visibility is compromised. Each kind of signal has its own specific meaning, and familiarity with these signals is necessary for all boat operators.