Dave,

I went to Sam's club a number of years ago and purchased a beach umbrella. It comes in a handy bag and has two sections. The main section with umbrella and then an add on pole that connects to it. It ends up standing about 6.5 feet tall and is about 6 feet in diameter. The end of it has a plastic point that is designed to be stuffed in the sand. It also has an option to angle the umbrella if need be. It is extremely lightweight and durable and takes up no room in the boat. Actually stows in a rod locker with the case on it.

I use it during high sun when out fishing walleyes. I stick mine in the walk through section of my windshield on my Deep V and velco the pole to one of my window support brackets. Obviously, you have a holder so you wouldn't need that. If memory serves me, it was not very much money to purchase. Maybe 20 bucks or so.