Battery Alarm menu (left). Low Battery Alarm Value (right).
Press the ↓ to SET VALUE. The Low Battery Alarm Value dialog box will appear. Input a voltage value between 7 and 18 volts. Use the ↑ ↓ keys to enter the first number in the dialog box, then press MENU DOWN to move to the next digit. Repeat those steps until the desired value has been entered in the dialog box. To move the cursor back to any of the previously entered numbers, press MENU UP. Press PWR to return to the Battery Alarm menu. Use ↑ to select ON, which will turn on the alarm, then press PWR to clear the menu. If the voltage value falls be- low the alarm’s setting, the alarm will sound and a message will ap- pear on the screen.
Noise Rejection and ASP
The ASP (Advanced Signal Processing) feature is a noise rejection system built into the sonar unit. It constantly evaluates the effects of boat speed, water conditions and electrical interference and automati- cally gives you the best display possible under most conditions.
ASP 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, wiring, air bubbles passing over the face of the transducer and even vibration from the engine. In all cases, noise can produce unwanted marks on the display.
41