If you have any interest in seeing the operation of a tug working barges in New York harbor today as presented by the Captain from the bridge while underway, with lots of hands on commentary on techniques, check out TimBatSea's youtube channel:
https://www.youtube.com/user/TimBatSea

For a macroscopic view of merchant shipping, with a focus on the US, though not exclusively, Sal Mercogliano's channel:
https://www.youtube.com/c/WhatisGoingonWithShippingwSalMercogliano