I see several have lost fish checkers. Because I kayak and things do fall over the side easier than in a boat, I used one of those blue sleeping mats you get a wal-mart, cut a piece the same shape as the checker, glued to the back. Now, it floats. I used that mat material for all types of things so I had one laying around, any type of floating material will work. A piece of swimming noodle tied to a string and attached to the checker will keep it from sinking.