Noise Reject 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.
Noise Rejection menu.
The ASP noise rejection feature is especially useful because, typically, it lets you operate the boat at all speeds without adjusting the sensi- tivity or other controls.
The ASP feature has three settings — Off, Low and High. When first turned on, noise rejection is set on low. If you have high noise levels, try using the high ASP setting. If, however, you are having trouble with noise, we suggest you take steps to find the interference source and fix it, rather than continually using the unit with the high ASP setting.
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