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- Q373 - Navigation Problems: Chart Plot
11. 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
On 3 January you get underway from Hall-Buck Coke Terminal Dock, Baton Rouge, LA, (mile 233.0 AHP) enroute to the Mobile Oil Docks (east side),(mile 176.4 UMR), in St. Louis. What is the length of the trip?
The correct answer is 897.2 miles. The trip distance is calculated by determining the distance from Baton Rouge to Cairo using AHP miles, then calculating the distance from Cairo to St. Louis using UMR miles, and summing the two distances. Cairo is approximately mile 953.8 AHP and mile 0.0 UMR, requiring conversion between the two mileage systems.
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