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Sonar Menu Tab
Noise Filter
(Advanced)
Settings: Off, Low, Medium, High 1, High 2, High 3;
Default = Low
Noise Filter adjusts the sonar Noise Filter to limit interference on the display
from sources such as your boat engine, turbulence, or other sonar devices.
The Off setting removes all filtering. Low, Medium, High 1, High 2, and High 3
settings add progressive filtering of the sonar returns. High 1, High 2, and
High 3 are useful when there is excessive trolling motor noise, but in some
deep water situations, the High settings may actually hinder your unit’s ability
to find the bottom.
SI Range Lines (with Contour Mode On)
Range Numbers
SI Range Lines