Sonar Tab - Garmin Fishfinder 340C Owner's Manual

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Sonar Tab

Use the Sonar tab to set up initial settings and calibrations.
The following settings are available:
• Auto Gain—controls the aggressiveness of the Auto Gain
when the Gain option is set to Auto (see
higher the setting, the greater the number of targets appear
on the screen. The lower the setting, the less clutter on the
screen. The settings are Low, Medium (default), and high.
• Auto Color Gain—controls what colors are applied to the
objects on the screen when the Color Gain option is set
to Auto (see page 35). Color dCG is based on depth and
makes it easier to spot subtle changes in bottom conditions
or fish sizes. dynaColor™ (default) represents the latest

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page 35). The
in sonar data presentation and is recommended for all
applications. The presentation is based on bottom strength.
It makes the bottom and the fish easier to see and requires
fewer adjustments.
• Keel Offset—allows you to offset the surface reading for
the depth of a keel. This makes it possible to measure depth
from the bottom of your keel instead of from a transducer's
location near the water line. Enter a positive number to
offset for a keel. You can also enter a negative number to
compensate for a large vessel that may draw several feet of
water, requiring the transducer to be submerged if you want
to measure from the water line. The Keel Offset is reflected
in the depth reading.
• Automatic Scroll Speed Limit—automatically adjusts
the scroll rate (see page 36) with the speed of your vessel
when the Scroll option is set to Auto (if equipped with a
speed sensor or receiving GPS NMEA input). Entering your
maximum cruising speed produces a 100% scroll rate when
you reach that speed. One half of that speed produces a 50%
scroll rate, and so on. The default is 30.0 kt.
• Transducer Type—allows you to specify what type of
transducer you are using.
Fishfinder 340C Owner's Manual