I asked a WCO and was told that the larger vessel always has the right of way, especially in the shallows when you are running full bore. There is not much to give when you are 3-4 inches of water and you have a cloud of canoes lingering across the entire span of the river. Its ok when you can see in front of you and can wait it out, but when you cant and you are already commited then i guess proceed with caution in my book.