USCG Exam PracticeRadar fundamentals and ARPA basics
A vessel required to carry ARPA under 33 CFR §164.38 is also required under 33 CFR §164.40 to carry a speed and distance device. Which accuracy standard applies to that device's speed indication when operating free from shallow water effect and environmental influences?
- A. Errors must not exceed 2 percent of vessel speed or 0.2 knot, whichever is greater
- ✓ Errors must not exceed 5 percent of vessel speed or 0.5 knot, whichever is greaterCorrect
- C. Errors must not exceed 5 percent of vessel speed or 1.0 knot, whichever is greater
- D. Errors 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 speed indication errors 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