shows a graph of the contrast. The screen will also show the effects of the change. If you reach the maximum or minimum level, a tone sounds alerting you to the limits. The menu will clear automatically after a few seconds or you can press the PWR key to clear the screen.
ASP (Advanced Signal Processing)
ASP is a program embedded in the computer that is specifically designed to eliminate noise. It continually monitors the signals from the receiver, determines which echoes are noise and rejects them. This allows true target echoes to display on the screen with a mini- mum of clutter. This feature is especially useful since it typically lets you operate the boat at all speeds without adjusting the sensi- tivity or other controls. When the unit is first turned on, ASP is enabled. To turn ASP off, press the menu key repeatedly until the ASP
menu appears. Now press the up arrow to turn it on or the down arrow to turn it off. The menu will clear automatically after a few seconds or you can press the PWR key to clear the screen.
SIMULATOR
A simulator is built inside that can show a simulated bottom signal with fish signals. All features of the unit work normally when the simulator is in use. You can change the range, zoom, and use the alarms as desired. To use the simulator, press the menu key repeatedly until the SONAR SIM menu ap- pears. Now press the up arrow to turn it on. Repeat the above steps to turn it off, or turn the unit off and back on again.
34