What does a diamond-shaped non-lateral marker warn of?

The diamond-shaped non-lateral marker is used to alert boaters about potential dangers in the water. These hazards may include obstacles like rocks, wrecks, or construction activities that could pose a risk to navigation and safety. By marking these dangers, boaters can exercise caution and avoid accidents, ensuring a safer experience on the water. The shape and coloration of the diamond marker are standardized to convey the specific warning to boaters effectively.

Low speed zones, safe swimming areas, and areas designated for fishing are typically marked with different types of markers that are more indicative of those specific uses or regulations, rather than a diamond shape which specifically highlights dangers.