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- Q393 - Navigation Problems: Chart Plot
1. 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 2345, on 25 December, you depart Memphis Harbor, McKellar Lake (mile 726.0 AHP — LMR) enroute to the Petroleum Fuel & Terminal Co. (144.6 AHP) in Angelina, LA, with a tow of eight full gasoline barges. If your vessel is making turns for 7.5 mph with an estimated average current of 1.5 mph, what is your ETA at the dock in Angelina, LA?
The ETA at the dock in Angelina, LA, is 1621 on 28 December. The river distance is 581.4 miles, and the speed over ground is 9.0 mph (7.5 mph vessel speed plus 1.5 mph current), resulting in a travel time of 64 hours and 36 minutes. Adding this travel time to the departure time of 2345 on 25 December yields the correct ETA.
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