If a sailing vessel with the wind on the port side encounters another sailing vessel and cannot determine the wind direction, what should she do?

In this situation, the correct action for the sailing vessel with the wind on the port side is to keep out of the way of the other vessel. This is because, when two sailing vessels meet, the one with the wind over its port side is generally required to give way to the other. The reasoning behind this is rooted in the rules of the road regarding right of way, which state that a sailing vessel with the wind on port tack should yield to a vessel on starboard tack.

This rule is designed to prevent collisions and ensure safe navigation, particularly in situations where the wind direction is not clear. By removing herself from the path of the other vessel, the sailing vessel ensures that both vessels can navigate safely without the risk of an accident.

Maintaining their course or changing course can lead to confusion and potentially dangerous situations, especially if the other vessel has the right of way. Signaling the other vessel would not directly address the immediate necessity of avoiding a collision in this situation, as clear action must be taken based on the understanding of right of way rules in sailing.