Humminbird 410030-1 Helix 12 Chirp SI 800x1280 DSP Sonar with GPS & Temperature, 12.1" Display size - diagonal: 12.1 inch Exclusive multi-range chirp-view low, Mid and high CHIRP ranges, either individually or all at once Use the 5-port Ethernet switch to link together multiple Hummingbird head units or share transducers Nmea 2000 ready-boat performance, weather or water conditions, make sense of it all with our networking solutions Access software updates to enhance the performance of your Hummingbird unit through my Hummingbird