I was motoring into boat ramp to put boat on the trailor.  There was a boat (boat "A") that was at the dock who started to motor into my pach as I was making my turn to line my boat up woth the trailer.  Boat "A" appeared to not see that I had entered into the loading zone and I felt this boat was going to hit my boat so I had to quickly stop my forward motion.  I did this by putting my boat into reverse.  A boat that was following close behind me, Boat "B" saw boat "A" but did not notice that I had came to a hault and hit the back side of my boat.
Mercer Island                 