At 0844, the range to the north end of...

Question 1 of 2921866636eea28f7522a1c51a958

At 0844, the range to the north end of Falkner Island is 2.0 miles and the left tangent bearing is 102°T. If the height of the tide is +1.0 foot, what is the approximate depth of the water under the keel?

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Question 1 of 29218

🔍 Key Concepts

• Use the charted depth (sounding) near the north end of Falkner Island at the 2.0 mile range and correct it for tide height to get the actual water depth at 0844. • Remember to account for the vessel’s draft (how much water the ship needs) to find the depth under the keel, not just total water depth. • Be sure you are using the correct unit conversions between feet and meters, and between chart datum and actual tide height.

💭 Think About

• What charted sounding (in feet) would you expect near the left tangent bearing to Falkner Island at about 2.0 miles, and how does the +1.0 ft tide affect that depth? • Once you know the actual water depth at that moment, what additional subtraction must you do to get the clearance under the keel? • Which answer choices are clearly too shallow or too deep once you think about a typical draft for a commercial vessel in that area?

✅ Before You Answer

• Confirm the chart datum for the sounding (usually mean lower low water) and add the +1.0 ft tide to find actual depth. • Verify you have subtracted the vessel’s draft from the actual depth to get depth under the keel. • Double-check that any feet/meters values you use are consistent so you don’t mix units when comparing to the choices.