Duluth Shipping News
I think Scott is correct the salt water ships can’t handle the sharp turns. The turn into CHS1 is really sharp and most salt water ships need help getting in there. Another reason most Lakers don’t need much help is they have thrusters on the bow and stern to help them turn in tight spaces. A ship would almost never come into port with it’s engine shutdown for safety reasons if something bad happened they would need to back away to a safe location.
Would ISA have had her engines shut down? If so, perhaps using the tugs is more efficient than starting the engines up again.
Typically ships built for Great Lakes service their rudders swing further, perhaps approaching 90 degrees, while ships built for ocean service may be only 45 degrees.
From what I have read before, most of the foreign flagged ships are not equipped to make the the sharp turns required in the harbor.
Why do some of the boats need tugs to help guide them in while others do not?
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