I am looking for a humminbird model to replace the 585C I have on the front. I need a model that will mount on the 585C base and use the US2 transducer in my terrova. I need GPS. I also need to network it with my 898 C SI so I can share waypoints. Sidescan and downscan not necessary. Does such an animal exist and if so what is the model number. Thanks!TS