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Rules of the roadQuestion 150 of 352

When are two vessels in sight of one another?

  1. When one can be seen by eye from the other
  2. When one shows on the radar of the other
  3. When one can hear the horn of the other
  4. When both are inside the same harbor
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Correct answer: When one can be seen by eye from the other

Radar contact or sound does not count. The vessels must see each other by eye.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 83: Inland Navigation Rules, § 83.03 General definitions (Rule 3)

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Questions last reviewed: 18 October 2026