Why the electronic charts can't have a code "Hazzard" symbol that is respective of scale that will flash on the screen. You COULD turn it off (say in a harbor or coastal area where the zooming isn't relevant to to) -- but otherwise within a certain range of your position. That way you could a 10, 20, 50 nautical mile hazard alert that you could enable -- irrespective whether it was, as DDW describes a pixel at that scale or not.

You could determine by a setup menu -- whether it as obstructions or marks and the like. .