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- Q403 - Navigation Problems: Chart Plot
31. The following questions (1-10) are based on the Army Corps of Engineers Mississippi River Maps (Cairo to the Gulf) and the Light List.
AHP = Above Head of Passes
LMR = Lower Mississippi River
UMR = Upper Mississippi River
OHR = Ohio River
ACOE = Army Corps of Engineers
At 1145, on 24 August, you depart Memphis Harbor, McKellar Lake (mile 726.0 AHP) enroute to Baton Rouge, LA, with a tow of twelve empty gasoline barges. You have received orders to proceed to the Amoco Pipeline Co. (mile 253.6 AHP) above Baton Rouge. If your vessel is making turns for 9 mph with an estimated average current of 1.5 mph, what is your ETA at the Amoco docks?
The ETA at the Amoco docks is 0845, 26 August. The distance between Memphis Harbor and the Amoco Pipeline Co. is 472.4 miles. With a speed through water of 9 mph and a 1.5 mph current, the speed over ground is 10.5 mph, resulting in a travel time of approximately 45 hours.
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