What should you do if you see a boat displaying a green flag?

When you see a boat displaying a green flag, it indicates that the vessel is engaged in a water activity, which can be various recreational activities such as skiing or tubing. This signal is essential for informing others on the water to be aware that there are participants in the water nearby. Understanding this signaling helps ensure that boaters maintain a safe distance to prevent accidents, while also allowing those engaged in activities to enjoy the water safely.

The other choices, while they may resonate with safe boating practices, do not directly correspond to the specific meaning of the green flag. For instance, approaching with caution or staying a certain distance may be relevant in other contexts but are not the primary action indicated by the presence of a green flag in this scenario. Reporting to authorities is generally reserved for more serious situations, such as emergencies or unsafe conditions, rather than a simple signaling of recreational activity.