Lowrance Elite-4 DSI Operation Manual - Page 38

Settings Noise Rejection Uses advanced signal processing to monitor the effects noise (boat pumps, water conditions, engine ignition systems, etc.) has on your display, and then filters out the undesired signals. Installation Provides access to Keel Offset and Temp Calibration settings. Manual Mode Restricts digital depth capability, so the unit will only send sonar signals to the selected depth range. That allows the display to continue smooth scrolling if the bottom depth is out of transducer range. WARNING: Manual mode should only be used by advanced sonar users. Installation menu Keel Offset All transducers measure water depth from the transducer to the bottom. As a result, water depth readings do not account for the distance from the transducer to the keel or from the transducer to the water surface. When the unit is in manual mode, you may not receive any depth readings, or you may recieve incorrect depth information. Transducer Keel Keel Offset (-3.5 feet) 36