What should you do if encountering a crossing sailboat and you are on the windward side?

When you encounter a crossing sailboat and find yourself on the windward side, it is essential to give way. This means that you need to allow the other vessel the right of way to pass safely. The term "windward side" refers to the side from which the wind is coming; in a sailing context, the sailboat typically has its sails trimmed and positioned to take advantage of the wind from that direction.

A sailboat under sail has specific navigational rules to adhere to, particularly regarding which vessels have the right of way. By giving way, you are ensuring the safety of both vessels and preventing potential collisions. This action is crucial because it respects the sailing vessel's maneuverability and the fact that they rely on wind power, which can limit their ability to change direction quickly compared to powered boats.

The other choices involve actions that do not prioritize navigation rules within the context of sailing. Simply standing on could lead to confusion and risk a collision, changing speed without giving way might not properly adjust the situation, and signaling with loud sound does not establish the necessary navigational hierarchy in this scenario. Thus, giving way is the safest and most appropriate action to take.