SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/boat-regulatory-open-diamond-danger

A white marker with an orange open diamond shape means what?

Danger.

  1. Boats keep out
  2. Danger ✔
  3. Operating rules in effect

Why: 33 CFR 62.33 says on orange-and-white markers an open diamond signals danger. Black lettering in or around the shape may say what the danger is.

Huh, didn't know that: These orange-and-white markers are maintained by the states, not the Coast Guard.

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Sources

  1. 33 CFR 62.33 Information and regulatory marks (eCFR) https://www.ecfr.gov/current/title-33/section-62.33
  2. USCG A Boater's Guide to the Federal Requirements for Recreational Boats (2023) https://www.uscgboating.org/assets/1/AssetManager/Boaters-Guide-to-Federal-Requirements-for-Receational-Boats-20231108.pdf

Test yourself in the game

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