Advanced Settings
Press MENU on any screen to access advanced options.
Range—By default, the range is set to Auto. The range of the depth scale on the right side of the screen adjusts automatically as the depth readings increase or decrease. Highlight Manual Range and press SELECT to manually adjust the scope of the depth scale.
Gain—controls the sensitivity of the Fishfinder 400C’s sonar receiver. By default, the Gain is set to Auto, which automatically sets the sonar sensitivity.
Advanced Settings
Highlight Manual Gain, and press SELECT to manually adjust the Gain. To see more detail, increase the Gain. If there is too much detail, or the screen is cluttered, decrease the Gain.
Beam—when using a Dual Beam transducer, select a wide or narrow beam.
Frequency—when using a Dual Frequency transducer, select how the frequencies appear on screen. By default, the frequency is set to 200kHz. You can specify that the unit uses only the 200kHz frequency, the 50kHz frequency, or Dual Frequency.
Note: If you choose Dual, the Split Freq screen appears.
Zoom—zoom in to a section of the Full Screen. The zoom is off, or set to No Zoom by default. Four options are available:
•2x Zoom—twice the magnification.
•4x Zoom—four times the magnification.
•Bottom Lock—locks the zoom window to the bottom. The default zoom span is 10 ft, and can be adjusted.
•Split Zoom—opens the Split Zoom screen.
