Master the Waves with the 2025 COLREGs Challenge – Navigate Your Success!

A vessel is required to sound a whistle signal when meeting another vessel head-on as part of the navigational safety measures outlined in the COLREGs. This applies specifically to Rule 14, which states that when two power-driven vessels are approaching each other in such a way that there is a risk of collision, each vessel must sound the appropriate whistle signal. Typically, this involves one prolonged blast to indicate the intention to pass starboard to starboard, emphasizing the need for communication to avoid misunderstandings and ensure safe passage.

In contrast, approaching a port generally does not necessitate a whistle signal simply for the act itself, as vessels typically follow established protocols and signals defined for port entries. Overtaking another vessel is addressed in a different manner under the COLREGs, where the overtaking vessel is not required to sound a whistle but must keep a safe distance while maneuvering. Entering shallow waters is also not specifically linked to a requirement for signaling with a whistle unless there is a risk of collision with another vessel. Therefore, the requirement to sound a whistle signal is most pertinent in the context of head-on encounters between vessels, highlighting the importance of communication in ensuring navigational safety.