Boating Coach US
Aids to navigationQuestion 234 of 352

What do you do when you see an isolated danger mark?

  1. Pass on any side, but keep well clear
  2. Pass only on the side with red
  3. Pass only on the side with black
  4. Tie up to the mark
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Correct answer: Pass on any side, but keep well clear

The mark sits on or near a danger. You can go around it on any side, but do not go close.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 62: United States Aids to Navigation System, § 62.29 Isolated danger marks

All questionsPractice the topic "Aids to navigation"

Questions last reviewed: 18 October 2026