If you intend to overtake a vessel in a narrow channel and plan to pass on the vessel's port side, how should you signal your intention?

In the context of overtaking another vessel in a narrow channel, signaling your intention is essential for maintaining safety and communication between vessels. When you plan to pass another vessel on their port side, the appropriate signal to give is two prolonged blasts followed by two short blasts.

This specific signal indicates to the vessel you are overtaking that you intend to pass them on their port side, which is important because it conveys your maneuvering intentions clearly. According to the Rules of the Road, communication through sound signals is vital, especially in narrow channels where navigational conflicts can easily occur due to limited space.

The other signal options do not correctly correspond with the intention to pass on the port side in a narrow channel. For example, one short blast typically indicates a plan to pass on the starboard side, while three short blasts imply that you are operating in reverse. One prolonged blast is often used to signal your presence in restricted visibility or while approaching a bend in the channel but does not specify your intention to overtake. Thus, the chosen signaling method ensures that all parties are aware of the intended movements, thereby promoting safe navigation.