NorthStar 6000i - Changing the frequency of echoes

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Reference section 6 — Echo sounding
Welcome to the Northstar 490 Echo Sounder
Northstar 6000i
SOUNDER key
SOUNDER
Auto
Picture
Frequency
Zoom
Depth
More
ECHO
SCREEN
Gain
Clutter
Noise Limiter
Hue
Signal level
Return
Shift
Range
Bottom box
Return
Alarms
Advance Speed
A-Scope
Data
Return
Fish alarm
Bottom alarm
Temp alarm
Return
Temp box
Temp graph
Bottom box
Speed
Return
Picture settings
Depth settings
More settings
Alarm settings
Data on-screen
Figure 8: Echo sounder menu structure