Humminbird on dash, Lowrance up front.
Everything. This is my second Charger. First one I bought new in 1987, this one is a 1996. While not the fastest boat on the water, it's fast enough to make me "pucker" the seat. I've ridden in several other makes of boats, and I've yet to ride in one that handles rough water as well as a Charger. If I were to buy another new boat today, it would be a Charger.
Nothing, except that it's not a brand new one.
Trailer Brakes
Onboard Battery Charging
Livewell Oxygenator