🔍 Key Concepts

• Geographic range of visibility based on the height of an object and the observer • Using the distance to the horizon formula from Bowditch or the Light List tables • How height of the light (in feet) converts to a distance in nautical miles

💭 Think About

• What information about Race Rock Light Tower would you normally look up in a Light List or chart before solving this? • Are you using the nominal range (how bright the light is) or the geographic range (when it just appears over the horizon)? • Which answer choice best matches the distance you get when you apply the standard distance-to-horizon relationship for that light’s height?

✅ Before You Answer

• Verify the height of the light above water from the Light List or chart before doing any math • Confirm you are using the geographic range, not luminous range, since visibility is excellent • After calculating, check if your value is reasonably close to one of the multiple-choice options before rounding