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USCG Exam Practice · Passing distance and CPA from chart plot

A vessel is required to be fitted with an ARPA under 33 CFR §164.38. Under 33 CFR §164.40, the speed-indicating device fitted to that vessel must meet which accuracy standard when operating free from shallow water effect and from the effects of wind, current, and tide?

  1. AErrors must not exceed 2 percent of vessel speed or 0.2 knot, whichever is greater
  2. BErrors must not exceed 5 percent of vessel speed or 0.5 knot, whichever is greater✓ correct
  3. CErrors must not exceed 5 percent of vessel speed or 1.0 knot, whichever is greater
  4. DErrors must not exceed 10 percent of vessel speed or 0.5 knot, whichever is greater

Why B is correct

33 CFR §164.40(b)(2) specifies that errors in indicated speed should not exceed 5 percent of the speed of the vessel, or 0.5 knot, whichever is greater, when operating free from shallow water effect and from the effects of wind, current, and tide.

Cited:33 CFR §164.40

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A vessel is required to be fitted with an ARPA under 33 CFR §164.38… — USCG Exam Practice · CaptainsGround