The Light List shows that a navigational...

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Question 1 of 2066636ee928f7522a1c519aa2

The Light List shows that a navigational light has a nominal range of 12 miles and a height above water of 25 feet (7.6 meters). Your height of eye is 30 feet (9.1 meters) and the visibility is 0.5 mile. At what approximate range will you first sight the light?

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🔍 Key Concepts

• Luminous range vs. nominal range vs. geographic range for lights • How meteorological visibility limits what you can see, regardless of lamp power • Using the luminous range diagram (or visibility limitation) when visibility is less than nominal range

💭 Think About

• If the visibility is only 0.5 mile, can you ever see any light farther than that, no matter how bright it is? Why or why not? • What does a nominal range of 12 miles actually assume about the visibility conditions? • Which of the answer choices matches the most restrictive factor: visibility, geographic range, or nominal range?

✅ Before You Answer

• Compare the 0.5-mile meteorological visibility with the 12-mile nominal range and ask which is the real limiting factor in this case. • Remember that nominal range is based on a standard visibility (about 10 NM), not on poor visibility conditions. • Check that your chosen distance does not exceed the actual visibility stated in the problem.

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