USCG Exam Practice · Rule 23 — Power-driven Vessel Underway (lights)
On a power-driven vessel of 20 meters or more in length carrying two masthead lights, the after masthead light must be at least how much higher than the forward masthead light?
- A1 meter
- B1.5 meters
- C2 meters✓ correct
- D2.5 meters
Why C is correct
33 CFR §84.02(a)(ii) states that when two masthead lights are carried, the after one shall be at least 2 meters vertically higher than the forward one. This is a minimum requirement; the vertical separation must also satisfy the 1000-meter visibility test in §84.02(b).
Cited:33 CFR §84.02(a)(ii)
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