AhaBulbStuff Everyone Should Know
AhaBulb: Stuff Everyone Should Know · ahabulb.com/boat-co-swim-platform

On many boats, where can deadly carbon monoxide build up while engines or generators run?

Near the stern and swim platform.

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  1. At the bow, upwind of the engine
  2. Only inside the engine itself
  3. Near the stern swim platform ✔

Why: The CDC says carbon monoxide can build up under the stern deck and near the swim platform and kill in seconds. Keep people off the back of the boat while engines or generators run.

Huh, didn't know that: The Coast Guard guide warns that CO poisoning can be mistaken for seasickness or being drunk.

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References

Answer: Near the stern swim platform. The CDC says carbon monoxide can build up under the stern deck and near the swim platform and kill in seconds. Keep people off the back of the boat while engines or generators run.

  1. CDC: About CO Poisoning on Your Boat www.cdc.gov/carbon-monoxide/about/boating.html
    CO that builds up in the air space beneath the stern deck or on and near the swim deck can kill someone in seconds.
    Checked 2026-10-08.
  2. USCG A Boater's Guide to the Federal Requirements for Recreational Boats (2023) www.uscgboating.org/assets/1/AssetManager/Boaters-Guide-to-Federal-Requirements-for-Receational-Boats-20231108.pdf
    Do not confuse carbon monoxide poisoning with seasickness or intoxication.
    Checked 2026-10-08.

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