Ok, I know this is exactly the same only different. I was on my boat yesterday and I guy was coming in with his 30' fishing boat and trying to get into his slip. He was coming in pretty fast, he tried to turn in but overshot. Instead of trying to correct by coming back from the other side, he pulled all the way out and tried again. Again, way too fast. This time while overshooting, he tried to back up go forward back up go forward, all too fast. I thought sure he would hit boats on my dock, but luckily he did not. Then he pulled all the way out again and tried again, and again, and again. All the while I'm thinking, do I tell him what to do. I know this is good practice for him but practicing wrong is just well wrong. So I got his attention. Got him to go very slowly, and he got in. Hopefully it will go better next for him. Some times you just have to speak up.