🔍 Key Concepts

• Light sectors and ranges as shown on the nautical chart for Cape Henry Light • Difference between geographic range (limited by earth’s curvature) and luminous/nominal range (limited by visibility) • How meteorological visibility (5 miles in this question) affects how far away a light can actually be seen

💭 Think About

• Look up Cape Henry Light on a chart and note the red sector’s listed range in miles—how does that compare to the visibility given in the question? • Think about whether you can ever see a light farther than the visibility reported in the area, regardless of what the charted range says. • Ask yourself: in this problem, is the limiting factor the light’s charted range or the 5‑mile visibility that is specified?

✅ Before You Answer

• Verify the charted range (in miles) of the red sector of Cape Henry Light on the chart or in the Light List. • Confirm that a vessel cannot sight a light at a distance greater than the prevailing visibility, even if the charted range is larger. • Check which answer choice is physically possible given that visibility is only 5 miles.