USCG Exam Practice · Plot true course and distance between two charted points
A vessel's speed log indicates 12.0 knots. Under 33 CFR §164.40, what is the maximum allowable speed error for this device when operating free from shallow water, wind, current, and tide effects?
- A0.5 knot
- B0.6 knot✓ correct
- C1.0 knot
- D1.2 knots
Why B is correct
33 CFR §164.40(b)(2) states errors shall not exceed 5 percent of the vessel's speed or 0.5 knot, whichever is greater. Five percent of 12.0 knots is 0.6 knot, which exceeds 0.5 knot, so 0.6 knot is the applicable limit.
Cited:33 CFR §164.40
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