That's clearly about a 40 ft boat. But, is that Nessie hiding underneath to avoid being seen by satellites, or was this taken at the moment she surged over the boat's transom Jaws style to grab the helpless boat passengers and feed her children seen swimming 150 feet to the west? Of course, in the real world, its just the boat's wake and just something floating in the water.
It has a pointy little nose, a wake, and has been rumored to playfully pull people at great speeds with wooden planks strapped to their feet.