The Light List shows that a navigational...

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Question 1 of 2066636ee928f7522a1c519aa9

The Light List shows that a navigational light has a nominal range of 18 miles and a height above water of 22 feet (6.7 meters). Your height of eye is 16 feet (4.9 meters) and the visibility is 2.0 miles. At which approximate range will you first sight the light?

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Question 1 of 20

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🔍 Key Concepts

• Geographic range vs. luminous (nominal) range of a light • Effect of meteorological visibility on how far a light can actually be seen • How to use a nominal range diagram or visibility limitation to adjust the listed nominal range

💭 Think About

• If the Light List says 18 miles, but the visibility is only 2 miles, which factor will actually limit what you can see first: the light’s power or the weather? • How does the height of the light and your height of eye affect the geographic range, and does that help you if the visibility is much less than that range? • Look at the choices: which ones are clearly greater than what can be seen in 2 miles of visibility, and which are consistent with a visibility-limited situation?

✅ Before You Answer

• Confirm that nominal range assumes 10 NM meteorological visibility – how does that compare to the 2 NM actually given? • Check whether the computed geographic range (from heights of eye) is greater or smaller than the visibility-limited range – the smaller one controls when you first see the light. • Before picking an answer, rule out any choice that is clearly beyond the stated meteorological visibility without special optical effects.

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