Set a Diver Group with boat in Grid: 022058 and give it a straight move order to Grid: 027061 (X: 2791 Y: 6138 z: 0. It does not seem to matter which direction they are pointing. The boat will normally head towards the pier and get hung up. I have reproduced this several times with the same results. Make sure to set your player as a Diver instead of Driver or Team Leader.