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Official online boating safety course for Wisconsin Wisconsin Department of Natural Resources

Boating Basics: On the Water

Non-Lateral Markers

Non-lateral markers are navigational aids that give information other than the edges of safe water areas. The most common are regulatory markers which are white and use orange markings and black lettering. These markers are found on lakes and rivers.

Illustrations What the Non-Lateral Markers Indicate
Information buoy Information: Squares indicate where to find food, supplies, repairs, etc. and give directions and other information.
Controlled area buoy Controlled Area: Circles indicate a controlled or restricted area such as speed limit, no fishing or anchoring, etc. Obey the restrictions described near the circle.
Exclusion buoy Keep Out: Crossed diamonds indicate areas off-limits to all vessels.
Warning buoy Warning: Diamonds warn of dangers such as rocks, shoals, construction, etc. The hazard will be described near the diamond. Always proceed with caution.
Channel Marker Buoys

Center channel buoy

Safe water buoy

Center Channel Marker Buoys are white with either black or red vertical stripes. They mark mid-channels or fairways and may be passed on either side. Be aware that outside of Wisconsin, black-and-white striped buoys usually indicate an obstruction to navigation.
Mooring buoy Mooring Buoys are white with a blue horizontal band and are found in marinas and other areas where vessels are allowed to anchor.

Safe channel buoy

Safe channel buoy

Safe Channel Buoys indicate that the safe boating channel is between them. When heading upstream, green marks the left side of the channel and red marks the right.
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Online boating safety handbook last modified: May 20, 2011
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