USCG Exam Practice · Rule 23 — Power-driven Vessel Underway (lights)
A power-driven vessel of 25 meters in length carries two masthead lights. What is the minimum required vertical separation between the forward and after masthead lights?
- A1 meter
- B2.5 meters
- C2 meters✓ correct
- D4 meters
Why C is correct
33 CFR §84.02(a)(ii) requires that when two masthead lights are carried, the after one shall be at least 2 meters vertically higher than the forward one. Additionally, §84.02(b) requires the separation to be sufficient so the after light is seen over and separate from the forward light at 1000 meters from the stem at water level.
Drill more Rule 23 — Power-driven Vessel Underway (lights) questions
Every CaptainsGround answer cites the rule it tests — verified, not guessed. Try a free 5-question drill, no sign-up.
More practice questions
- At night you observe a vessel displaying an all-round flashing yellow light in addition…
- A power-driven vessel of less than 12 meters in length is underway at night. In lieu of…
- A power-driven vessel of 60 meters in length is underway. Where must the forward masthe…
- On a power-driven vessel of 20 meters or more in length, the sidelights must be placed …
- A power-driven vessel is operating on the Great Lakes at night. Which substitution for …
- According to the Inland Navigation Rules, which of the following factors must ALL vesse…