Garmin Fishfinder 340C Owner's Manual page 41

To change an Adjustment Menu setting:
1. Press ADJ/MENU. A list of all options and their current
settings appears. The Adjustment Menu automatically
disappears when idle for 20 seconds, or you can press
ADJ/MENU to exit.
2. Press the ROCKER to select the option that you want to
change, and then press ENTER to show the settings. The
current setting is highlighted in yellow.
3. Press the ROCKER to select a new setting.
4. Press ENTER to accept the new setting and return to the
Sonar Page.
The current adjustment option appears in the upper-left corner
of the screen. For fast adjustment from a Sonar Page, press left
or right on the ROCKER to scroll through the options. Press up
or down on the ROCKER to change the current setting, or press
ENTER to review the setting before you make changes.
Available adjustments are:
• Range—sets the screen depth range used for viewing. Auto
(recommended) automatically tracks the bottom, or you can
set a specific depth range (making sure the range includes the
bottom of the water).
Fishfinder 340C Owner's Manual
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• Gain—controls the sensitivity of the Fishfinder's sonar
receiver. Auto (default) is the recommended setting. It
automatically sets the sonar sensitivity. You can also set the
gain manually. To see more detail on the screen, increase the
receiver sensitivity by selecting a higher gain. If there is too
much detail or if the screen is cluttered, lower the sensitivity
(lower the gain) to increase the clarity of the screen. If
Frequency is set to Dual, you can set the Gain separately for
each frequency (50 kHz and 200 kHz).
• Color Gain—controls what colors are applied to the objects
on the screen. Auto (default) is the recommended setting.
It automatically sets the colors, based on your Auto Color
Gain setting. You can also set the Color Gain manually.
If Frequency is set to Dual, you can set the Color Gain
separately for each frequency (50 kHz and 200 kHz).
• Beam—only appears when using a dual beam transducer.
This controls the angle of the transducer beam. Wide beam
allows you to see more fish in shallow water, even off the
sides of the boat. You can also choose Narrow (default)
beam.
• Whiteline—can make it easier to identify the hardness of the
bottom (hard or soft). This setting adjusts a brightly-colored
highlight of the strongest signal area of the bottom.
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