Your vessel has a draft of 34 feet. On 8...

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Question 1 of 2066636ee928f7522a1c51a5ca

Your vessel has a draft of 34 feet. On 8 October 1983 you wish to pass over an obstruction near Jaffrey Point, NH, that has a charted depth of 31 feet. Allowing for a safety margin of 3 feet, what is the earliest time after 0900 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 (how to combine them to get total water depth) • Under-keel clearance: draft + safety margin compared to available depth • Using a tide table for a specific date, location, and time zone (DST, ZD +4)

💭 Think About

• How much total water depth do you need over the obstruction, given the vessel’s draft and the required safety margin? • Once you know the required tidal height, how do you find the first time after 0900 DST when the tide reaches at least that height at Jaffrey Point on 8 October 1983? • How does Daylight Saving Time (DST, ZD +4) affect the times you read or interpolate from the tide table?

✅ Before You Answer

• First, compute required depth = draft + safety margin, then compare it to the charted depth to find the minimum tidal height needed. • From the tide table, identify the high and low waters around 0900 for Jaffrey Point on 8 October 1983, and use interpolation if needed to find when the tide reaches the required height. • Double-check that your final time is expressed in DST (ZD +4) and that it is the earliest time after 0900 that meets or exceeds the required tidal height.

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