Using the Fishfinder 340C > Using the Main Menu

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 page 35). The 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

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.

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Fishfinder 340C Owner’s Manual