Your draft is 24 feet. You wish to pass over...

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Question 1 of 2066636ee928f7522a1c51960d

Your draft is 24 feet. You wish to pass over an obstruction near Lovell Island, MA, on 6 May 1983. The charted depth is 22 feet. Allowing a safety margin of 3.0 feet, what is the earliest time after 0200 DST (ZD +4) that this passage can be made?

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Question 1 of 20

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🔍 Key Concepts

• Tidal height vs. Charted depth – remember that charted depths are usually relative to Mean Lower Low Water (MLLW) unless otherwise noted • How to use a tide table for a specific location, date, and time zone (DST, ZD +4) • Required minimum depth under the keel = draft + safety margin, and how to find when the tide provides that extra depth

💭 Think About

• First, compute the minimum total water depth you need over the obstruction, combining draft and safety margin, and compare this with the charted depth • Then determine how much tide height above chart datum is required to make that depth safe • Use the given date/time information to figure out where 0200 DST falls relative to high and low water for Lovell Island, then estimate at what time the required tidal height is first reached after 0200

✅ Before You Answer

• Confirm what datum the 22‑foot charted depth is referenced to on the chart legend • Verify that your required depth is correctly calculated: draft + safety margin > charted depth, and determine the extra depth needed from the tide • Check that the time you choose is the earliest time after 0200 when the predicted tidal height meets or exceeds the extra depth you need over chart datum

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