Which signal indicates confusion or uncertainty about another vessel's intentions?

The signal that indicates confusion or uncertainty about another vessel's intentions is represented by not less than five short blasts. This signal is recognized in maritime navigation as a way to communicate to other vessels that there is a lack of understanding regarding their movements or actions.

In marine communication, sounds like blasts from a horn serve specific purposes. The use of five short blasts specifically indicates that a vessel does not understand or is questioning another vessel's intentions. It is crucial for maintaining safety on the water, as it helps to clarify intentions and avoid potential collisions.

Other signals, such as one prolonged blast or one short blast, convey different messages, like signaling presence or turning intentions, while three short blasts indicate a vessel is operating astern propulsion. Understanding these distinctions helps ensure effective communication and safety among vessels in navigation.