Just wanted to pass along some photographs I ran across recently, to show why the Coast Guard might have a hard time stopping a modern merchant ship with our 25 and 57mm guns.
This is an extreme example, but it is the way the industry is going. The ship is 1302 ft in length, 207 ft of beam, and has a maximum speed of 31 knots. That means it can transit the 200 nautical miles from the edge of the EEZ to the coast in less than 6.5 hours.
Thanks to James Udan for bringing this to my attention.