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Safety equipmentQuestion 160 of 566

What is the minimum diameter of an approved lifebuoy?

  1. 610 mm (24 in)
  2. 300 mm (12 in)
  3. 450 mm (18 in)
  4. 900 mm (36 in)
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Correct answer: 610 mm (24 in)

Smaller lifebuoys and horseshoe-type devices are not approved.

Source: Safe Boating Guide (TP 511E, 2026), Lifejackets and PFDs, page 23

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Questions last reviewed: 18 October 2026