What sound signal is used by a power vessel that is stopped?

The correct choice, which identifies the sound signal used by a power vessel that is stopped, is essential for understanding the communication protocols established by the COLREGs. When a power vessel is at anchor or not under way, it must signal its presence to other vessels to prevent potential collisions and ensure navigational safety.

The proper sound signal for a power vessel that is stopped and not making way is indeed five short blasts. This specific sound signal serves to alert other vessels that the stopped vessel may not be maneuverable or is on an unpredictable course, allowing approaching vessels to take necessary precautions while navigating in its vicinity. The use of five short blasts is a clear and standard communication that is widely recognized in maritime practices.

This understanding is key for maintaining situational awareness on the water and ensuring safe navigation between vessels, especially in busy or restricted waterways.