Safety equipmentQuestion 539 of 566

The boat is not moving, but a generator runs. What can build up?

  1. Propane only
  2. Fresh air
  3. Water in the bilge
  4. Carbon monoxide
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Correct answer: Carbon monoxide

A fuel-burning engine or appliance running at rest can cause CO to build up.

Source: Safe Boating Guide (TP 511E, 2026), What to know about Carbon Monoxide, page 67

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Questions last reviewed: 18 October 2026