If you believe the other vessel is not taking necessary action, which action might you take?

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When you’re concerned that the other vessel isn’t taking the action needed to avoid a collision, you use a recognized whistle signal to attract attention and indicate your concern. Five or more short blasts on the whistle is the standard signal for warning or doubt — it tells the other vessel, in a clear audible way, that you believe they may not be acting safely and you expect them to take proper action. It’s not about how you maneuver your own boat; it’s about communicating risk and prompting a response from the other vessel.

Doing nothing wouldn’t notify them of the risk. Increasing speed could actually heighten danger or reduce your ability to maneuver in time. Turning to port is a maneuver, but without the whistle signal to communicate your concern, it doesn’t address the need to warn or request action from the other vessel.