I've seen several comments that steering the boats was not consistently working for many players, so this patch is an attempt to resolve these issues. I haven't been able to reproduce the described problems myself, so this is a bit of a shot in the dark, but it might help!
The main change here is an adjustment to the way angular force is derived from the boat's rudder. Previously I had a quite complex method that examined the relative velocity of the rudder to the water, and applied force based upon how much drag would be generated from the water flowing past the rudder.
Now I'm doing a much simpler calculation which turns the boat based on your speed and steering wheel angle, it actually feels pretty much the same but should be more consistent in the amount it turns your boat.
Give it a try and let me know what you think in the discussion board, or right here!