The Furuno FCV-600L (a legacy 350W, 5.6-inch color dual-frequency fishfinder) is widely praised for its rugged reliability and exceptional bottom-tracking. However, its interface and sonar processing are dated. Today, Furuno’s FCV-600 serves as the modernized replacement with significantly enhanced Features & CapabilitiesSonar Technology: The older FCV-600L operates on 50/200 kHz traditional Continuous Wave (CW) frequencies. Its modern successor, the Furuno FCV-600, adds TruEcho CHIRP for superior target separation and depth penetration.Resolution: The legacy 600L uses a standard color LCD screen. The new model boasts high-definition, daylight-viewable palettes