i run them both, usually at 50 it will lock onto my downrigger balls and call them bottom and i get nothing, but in champ i run faster speeds and they drift back and don't mark as bottom and 50 covers a wider angle with some loss in definition. in winni i am almost always on 200 also i run the gain at "Auto Hi" play with it that C80 has more options and settings than anything i have ever seen.