It has always been hard for me to believe that operating a power boat can lead to collisions, must have been some pretty high cruising speeds.
I can understand when I am hanging those big rags from my masts.
but have never been close in my powerboats
Nothing surprises me any more. I still remember doing an informal club race one fall. Here we had a bunch of sailboats, all beating and heading in the same direction. We were in the lead, and there was a 15'+- skiff in our path. Despite the big rags hanging from the rigging, we saw him quite early on. He was puttering forward, right to left across our path, at a slow rate of speed, oblivious to our presence. The relative angle of the two boats was not changing, so we were on a collision course. When he finally saw us, he got this deer in the headlights look (probably due to the sight of the 25# CQR on our bow that was going to hit him in the head if he didn't do something), and started to slow down. We were trying to figure out whether to go above or below him, and he was essentially playing chicken with us. At the last minute, he slammed the boat in reverse and got out of our way. It was freakin' scary.
We finished the race, got shot at (yay!) and got back to our mooring. This same boat started to putter past us, and we waved him over. My husband wanted to have a nice, civil but educational conversation with the guy in hopes that he might learn something about rules of the road and the need to pay attention. Then the guy almost ran into a moored boat nearby.
Some boaters are just clueless, and unfortunately, not much we can do about that.