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USCG Exam Practice · Plot true course and distance between two charted points

A vessel required to carry ARPA under 33 CFR §164.38 is also required to carry a speed and distance device. Under 33 CFR §164.40, the maximum allowable error in indicated speed, when free from shallow water effect and environmental influences, is:

  1. A1 percent of vessel speed or 0.1 knot, whichever is greater
  2. B5 percent of vessel speed or 0.5 knot, whichever is greater✓ correct
  3. C10 percent of vessel speed or 1.0 knot, whichever is greater
  4. D5 percent of vessel speed or 0.5 knot, whichever is less

Why B is correct

33 CFR §164.40(b)(2) specifies that speed errors should not exceed 5 percent of the vessel's speed or 0.5 knot, whichever is greater. Option D uses the same numbers but substitutes 'whichever is less,' which is incorrect.

Cited:33 CFR §164.40

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A vessel required to carry ARPA under 33 CFR §164.38 is also requir… — USCG Exam Practice · CaptainsGround