Your vessel has a draft of 23 feet. On 23...

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Question 1 of 2066636eea28f7522a1c51b7af

Your vessel has a draft of 23 feet. On 23 June 1983 you wish to pass over a temporary obstruction near Beaufort, SC, that has a charted depth of 22 feet. Allowing for a safety margin of 3 feet, what is the earliest time after 1600 DST (ZD +4) that this passage can be made?

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Question 1 of 20

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🔍 Key Concepts

• Under-keel clearance: Compare vessel draft + safety margin to charted depth to find the required tide height above chart datum. • Tide tables and corrections: Use the tide table for Beaufort, SC on 23 June 1983 and apply any needed corrections for the obstruction location. • Interpolation between high and low water: Use the rule of twelfths or table interpolation between high and low tide heights to estimate when the needed tide height is reached.

💭 Think About

• How much additional water (tide height) do you need above the charted depth so your draft plus safety margin is safe? • Looking at the tide heights for that day, during which rising or falling tide period will that extra height be available, and around what time? • When you interpolate between the two surrounding tide times and heights, which choice most closely matches the first time your required height is reached after 1600?

✅ Before You Answer

• Compute the required depth: draft + safety margin, then subtract the charted depth to get the minimum tide height needed. • Check you are using the correct time zone conversion: local time is given as DST (ZD +4); make sure you’re reading the tide table in the same reference. • Verify which tide cycle (before or after the nearest high water after 1600) first provides at least the required tide height before selecting the answer.

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