Lowrance electronic X-65 manual Adjust Chart Surface Clarity, ASP Advanced Signal Processing

sounds for each fish symbol size shown on the display. To turn the fish alarm on, press the ALARM key, then highlight the "Fish Alarm" label and press the right arrow key. The unit will revert to the sonar display with the fish alarm turned on. Repeat the above steps to turn the fish alarm off.

Note: If the unit is in the manual mode, turning the Fish Alarm on will also turn the automatic mode and Fish ID on, also.

ADJUST CHART SURFACE CLARITY

The markings extending downward from the zero line on the chart are called “surface clutter.” These markings are caused by wave action, boat wakes, temperature inversion, and other natural causes.

The Surface Clarity Control (SCC) reduces or eliminates surface clutter signals from the display. SCC varies the sensitivity of the receiver, decreas- ing it near the surface and gradually increasing it as the depth increases. The maximum depth that SCC will affect is 75% of the selected depth range. For example, on a 0-60 foot range with maximum SCC, surface clutter will be reduced down to 45 feet.

There are three levels of SCC avail-

able on the X-65: low, medium, and high. When it’s turned on for the first time, the SCC level is low. To change it, press the MENU key, then press the up or down arrow keys until the "Surface Clarity" menu appears. Now use the left or right arrow keys to change it. When you're finished, press the EXIT key to erase the SCC menu.

ASP (Advanced Signal Processing)

The ASP feature is a noise rejection system built into the X-65 that constantly evaluates the effects of boat speed, water conditions, and interference. This automatic feature gives you the best display possible under most conditions.

The ASP feature is an effective tool in combating noise. In sonar terms, noise is any undesired signal. It is caused by electrical and mechanical sources such as bilge pumps, engine ignition systems and wiring, air bubbles passing over the face of the transducer, even vibration from the engine. In all cases, noise can produce unwanted marks on the display.

22