Had no idea how much I was missing this!  The way I have it positioned the view is  from one rear bimini support to the other and the entire rear end of the boat to include the motor.  Fantastic!  For how I mounted it there is one swivel point missing so I fabricated a simple frame to enable mounting high on the bimini top frame rather than the windshield.  Check out the pics of the install on my pontoon.  Perfect.  It comes with 3 different thicknesses of "wedges" that mount to one side inside the bracket jaws to accommodate various mounting thicknesses.  Choose the one you need.  This is the only one on the market that opens to 1 1/4" and fits standard pontoon rails.