I also tried to get him used to being in a boat. The boat is metal and makes a lot of noises, which don't seem to bother him. I turned the boat right-side-up and let him hang out in it while it was on dry land. He loved it! He tried jumping in and out of it, which didn't work out too well for him! I couldn't wait to take him out on the water!
I also have tried to get him used to gunfire. While he's outside in his pen, he can hear the shotgun blasts all around us. It doesn't even phase him. We'll see how he does with it being right over his head! We know that we have to be very careful not to make him gun shy, but I'm impressed with his bravery so far!