At 0715, on 24 May, you are abreast the St. Catherine Bar Lt. (mile 348.6 AHP). If you are turning for 8.0 mph, what has been the average current since you left Baton Rouge?
• Still-water speed vs. speed made good over the ground • Average current = Difference between actual progress and engine (ordered) speed • Using river mile marks (AHP – Above Head of Passes) to find distance run over the ground
• From Baton Rouge to St. Catherine Bar Lt., what total distance in river miles have you actually traveled over the ground? • Given your ordered speed is 8.0 mph, how far should you have gone in the actual elapsed time if there were no current? • Once you have both distances (no‑current distance and actual over‑ground distance), how do you turn that difference into an average current over the whole run?
• Be sure you are using total distance from Baton Rouge to mile 348.6 AHP, not just a single reach. • Use elapsed time from departure at Baton Rouge to 0715; do not plug in any other time interval. • Compute speed made good over the ground (SMG) first, then compare SMG with 8.0 mph to get the average current.
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