What type of non-lateral marker helps inform boaters of distances to destinations?

The correct answer is square, as square-shaped non-lateral markers are specifically used to convey information such as distances to various locations. These markers serve vital informational purposes by providing navigational assistance to boaters.

Each shape of marker generally has a specific meaning in the context of navigation. For instance, triangular markers often indicate caution or hazards, circular markers are used primarily for regulatory information, and diamond-shaped markers typically indicate danger. In contrast, the square shape is dedicated to providing navigation-related information, including distance measurements, which can be crucial for boaters in planning their routes and ensuring safe travel on the water.