Depth Lines; 455 Khz Sensitivity; Noise Filter - Humminbird HELIX 5 SERIES Operation Manual

455 kHz Sensitivity adjusts the sensitivity of the 455 kHz beam. Increase the sensitivity to display
additional weak returns and decrease the sensitivity to display fewer weak returns.
Depth Lines divide the display into four equal sections which are separated by three horizontal depth
lines. The depth of each line is displayed along the depth scale. You can turn Depth Lines On or Off.
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, and High 1, High 2, 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.

455 kHz Sensitivity

(Advanced, HELIX DI GPS only)
Settings: -10 to +10, Default = 0

Depth Lines

(Advanced)
Settings: Off, On; Default = On

Noise Filter

(Advanced)
Settings: Off, Low, Medium, High 1, High 2, High 3; Default = Low
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depth lines
Sonar Menu Tab