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- Q393 - 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 1707, on 23 May, you get underway from mile 234.2 (AHP) enroute to Louisville, KY. mile 612.6 (OHR). What is the length of the trip?
The trip length from mile 234.2 AHP to Louisville, KY (mile 612.6 OHR) is 1088.5 miles. This is calculated by determining the distance traveled on the Lower Mississippi River to Cairo, then the distance on the Ohio River from Cairo to Louisville, using the correct mile-zero reference for each river and subtracting mile markers to find segment distances.
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