An improved marine anode sled comprises a single piece casting with high surface to weight ratio providing increased active surfaces and improved reliability. In one embodiment the anode weighs about 2,000 lbs and has an active surface area of about 5,000 square inches and a current output capacity of up to 160 amps. The improved anode has considerably higher current output than existing anode sleds with similar weight. Unlike known anode sleds, the entire exposed surface of new anode sled is anode material and passes current to a surrounding medium. The single piece casting eliminates structural failure when a frame of know anode sleds is damaged, and electrical failure when cables connecting multiple anodes are damaged. Two redundant lead cable are attached proximal to opposite corners to optimize reliability and electrical performance.