Excellent point Carl

Shooting from a little boat either/both bobbing up and down or speeding around (possibly Zig-Zagging), at another (same-same), on an Ocean (there-abouts) where 10 ft swells (higher than your deck) is considered a calm sea, and hitting virtually anything would be a miracle in itself !

I believe your numbers are close.

The barges shooting back at you have the advantage...no doubt. Your best shot may be in scaring them into running aground, wait for daylight, and call in the airplanes.

__________________
All opinions expressed here are those of "Little Green Men" and don't necessarily represent views, positions, policy, thoughts, actions, or anything else.