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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 marker: White buoy with directions inside an orange square Information: Squares indicate where to find food, supplies, repairs, etc. and give directions and other information.
Controlled area marker: White buoy with speed limit inside an orange circle Controlled Area: Circles indicate a controlled or restricted area such as speed limit, no fishing or anchoring, ski only or no skiing, or “slow, no wake” zones.
Exclusion marker: White buoy with orange crossed diamond  and labeled Swim Area underneath Restriction: Crossed diamonds indicate areas off-limits to all vessels such as swimming areas, dams, and spillways.
Danger marker: White buoy with an orange diamond that warns of danger Danger: Diamonds warn of dangers such as rocks, shoals, construction, dams, or stumps. Always proceed with caution.
Channel Marker Buoys
Inland waters Obstruction Markers: Buoy with black and white vertical stripes Inland Waters Buoys are white with black vertical stripes and indicate an obstruction to navigation. You should not pass between these buoys and the nearest shore.
Mooring Buoys: White buoys with blue horizontal stripes Mooring Buoys are white with a blue horizontal band and are found in marinas and other areas where vessels are allowed to anchor.
All-green and all-red companion buoys All-Green and All-Red Companion Buoys indicate that the boating channel is between them.
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Online boating safety handbook last modified: February 3, 2009
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