Hope you like you Hummingbird. In twenty years I've had four HB finders, still have one but....every one I've owned or used have fogged in an early morning dew, never mind rain! Sent two back, twice each, and they continued to fog anyway. Just gave up and sold the first three, but keep my present (expensive) model 3ID (the first generation 3D model) and live with the fog.
Never had any fog troubles with any Lowrance/Eagle tho.