Furuno FCV800 CHIRP Fish Finder [FCV800]FCV800 CHIRP Fish Finder The 8. 4 FCV800 includes all of the functionality of the FCV600 but features dual transducer ports, allowing for the simultaneous use of both CHIRP and CW channels. The dual transducer ports of the FCV800 offer the best of both worlds. Features such as Furunos Accu Fish fish size assessment tool and Bottom Discrimination to display what kind of material the bottom is composed of require a dual frequency CW transducer, while