You want to transit Hell Gate, NY on 23 July 1983. What is the period of time around the AM (ZD +4) slack before ebb when the current will be less than 0.3 knot?
• Tidal current table for Hell Gate, NY on 23 July 1983 • Definition of slack before ebb and how it relates to maximum flood and maximum ebb • How to interpret a range of times when current speed stays below a certain value
• First, identify the AM slack before ebb at Hell Gate for 23 July 1983 (ZD +4). What exact time is shown in the current table? • Next, look at the predicted current speeds immediately before and after that slack time. Over what time span on each side of slack does the current remain between +0.3 knot and -0.3 knot? • Compare those times with each of the answer choices. Which choice best matches the full interval when the current magnitude is less than 0.3 knot?
• Make sure you are using the Hell Gate, NY current station (not The Battery or a reference station). • Confirm you are reading the current predictions, not the tide height predictions. • Carefully check the time zone (ZD +4) and the sign and magnitude of the current to see when it first drops below 0.3 knot and when it rises above 0.3 knot again.
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