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- Q403 - Navigation Problems: Chart Plot
45. What is the vertical clearance between the highest point of your towboat, if it is 45 feet above the water, and if the Natchez Gage reads 23.4 feet when passing under the Natchez-Vidalia Westbound Highway Bridge?
Vertical clearance is calculated by subtracting the gage reading and the towboat's air draft from the bridge's low-steel elevation: 126.0 feet — 23.4 feet — 45.0 feet = 57.6 feet.
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