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Controlled area
controlled area, such as a no-wake zone
It is a control buoy- indicates speed limits, no-wake zones, etc
White buoy's with orange markings and black lettering are a regulatory marker for boaters.
keep out of that area
This is a non-lateral marker. It can indicate a controlled area, such as no wake. It can be an informational marker, a "keep out" marker, or a warning marker (Dam, Rock, etc)
keep out of that area
Watch out for dangers such as rocks or stumps.
A white buoy or sign with an orange circle and black lettering indicates controlled or restricted areas on the water. The most common restriction is slow, no wake speed. Slow, no wake means operating your boat at the slowest possible speed necessary to maintain steerage, but in no case greater than five miles-per-hour.
These markers are used as navigation aids indicating prohibited area, danger area, restricted area and general instructions. They are also known as non-lateral markers.
An orange circle means a controlled area, such as a speed limit, anchoring or wake restrictions.They all look very similar, so you may want to refer to the explanation of more shapes: http://www.boatsafe.com/nauticalknowhow/regmarks.htm*NOTE that an orange diamond with black lettering within the diamond means a danger exists, such as rocks, shoals, stumps, or dams.