You are approaching another vessel on crossing courses. She sounds a signal of five short blasts. What should you do?

When another vessel sounds five short blasts, it is indicating doubt about your intentions, often suggesting that the other vessel is uncertain whether it is safe for you to pass. The appropriate response is to make a large course change to avoid a potential collision. This action demonstrates your commitment to safe navigation and your willingness to comply with the other vessel's request for clarity about your maneuvering.

Maintaining your course and speed would not be appropriate in this situation, as it could lead to confusion or a dangerous encounter. Similarly, speeding up to pass quickly does not address the concern raised by the other vessel and could exacerbate the situation. Slowing down and waiting might seem like a reasonable option, but it may not sufficiently resolve the uncertainty expressed by the five short blasts. Therefore, making a large course change is the most effective way to ensure safety and clarity on the water.