I was at a COE campground this week just below a dam and lock where it forms a narrow lake, there is some commercial barge traffic. I happened to be flying my Mavic Mini over the water right before sundown when one of the barges was passing through. Did keep it up and got some good footage of it approaching, but didn't want to cause any issues so did a RTH before it got close to the air space I was in. My question is, does anyone know of the protocols involving commerical boating traffic? A fly over at a decent altitude would have been really cool, but didn't want to violate any regs or laws.