Section 4: Sonar Options
ASP™ (Advanced Signal Processing)
The ASP™ feature is a noise rejection system built into the sonar unit that constantly evaluates the effects of boat speed, water conditions and interference. This automatic feature gives you the best display pos- sible 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.
The ASP feature has four settings — Off, Low, Medium and High. If you have high noise levels, try using the "High" ASP setting. However, if you are having trouble with noise, we suggest that you take steps to find the interference source and fix it, rather than continually using the unit with the high ASP setting.
There are times when you may want to turn the ASP feature off. This allows you to view all incoming echoes before they are processed by the ASP feature.
Sonar Menu with Sonar Features highlighted (left). Sonar Features menu (right) with Noise Rejection (ASP) set to default low setting.
To change the ASP level:
1.From the Sonar Page, press MENU↓ to SONAR FEATURESENT.
2.Press ↓ to NOISE REJECTIONENT.
3.Press ↓ or ↑ to select a setting, then press ENT.
4.To return to the previous page, press EXITEXIT.
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