Which type of marker is best for indicating a no-wake zone?

A circle is the correct marker for indicating a no-wake zone because it is a recognized symbol in boating that effectively communicates to boaters that they need to reduce their speed to minimize water displacement and avoid creating wakes. This is especially important in areas where excessive wake can affect other vessels, shorelines, wildlife, and structures.

The use of a circular marker helps ensure clarity and immediate recognition among boat operators, promoting safe boating practices and compliance with local regulations. This shape is standardized in many navigational guides and resources, thus reinforcing its importance as a universal signal for no-wake zones. Other types of markers, while having specific meanings, do not convey the no-wake concept as universally or clearly as the circle does.