Lowrance Elite-4 Operation Manual - Page 38

Settings Sonar Used to make adjustments to Sonar options and display settings like Noise Rejection, Surface and Fishing Mode. 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 undesired signals. Restricts unit's digital depth search capability Sonar Settings Menu Surface Clarity (Advanced Mode only) Surface Clarity reduces surface clutter by decreasing the sensitivity of the receiver near the surface. Surface Clutter 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. 36