Montauk Point Light has a radar range of 3.9...

Montauk Point Light has a radar range of 3.9 miles and bears 170°T at 2232. What is the depth of water below your keel?

🔍 Key Concepts

• Using a height of eye and radar horizon table to convert radar range to the light’s geographic range and then to charted height or your distance offshore • Relating your distance from Montauk Point Light to the charted depth contours on the appropriate nautical chart • Finding your vessel’s draft and subtracting it from charted depth (adjusted for tide) to get depth below keel

💭 Think About

• How can you use the given radar range of the light (3.9 miles) and your height of eye to estimate how far you are from Montauk Point and which depth contour you are near? • Once you know your approximate charted depth at that position, what additional information must you apply (draft, tide height) to determine the depth of water below your keel? • Look at the answer choices: which one is most reasonable given typical depths in the approaches to Montauk Point where you would first pick up the light on radar at about 3.9 miles?

✅ Before You Answer

• Verify the radar range / radar horizon calculation: are you using the correct formula or table that combines your height of eye and the light’s height? • Confirm the charted depth at your approximate position off Montauk Point based on that distance offshore (compare it to the nearest contour line). • Be sure you have subtracted the vessel’s draft from the corrected depth (including tide) to get depth below the keel before matching it to the choices.

🔍 Key Concepts

💭 Think About

✅ Before You Answer