Using the Fishfinder 340C > Using the Adjustment Menu

Off (default)—all high-intensity bottom returns appear as a solid color.

Whiteline Turned On

Whiteline Turned Off

On—the strongest signal from the bottom appears as a bright color.

•Frequency—only appears when using a dual frequency transducer. This allows you to choose a sonar operation frequency. You can choose 200 kHz, 50 kHz, or Dual frequency (to alternate between the two frequencies).

•Scroll—adjusts the rate at which the Sonar Pages scroll from right to left. Ultrascroll (default) is used when you select a scroll rate from 90% to 100%. Auto automatically adjusts the scroll rate according to the boat’s speed. (See also

“Automatic Scroll Speed Limit” on page 28.)

•Depth Line—adds a horizontal depth line across the screen that is used to measure the depth of underwater objects. The depth of the line appears on the right side of the line. Press up or down on the ROCKER to control the position of the line on the Sonar Pages. Move the slider to the top to turn off Depth Line.

•Zoom—sets a screen zoom scale. The following settings are available:

Off—turns off the Zoom function.

2x Zoom––increases the graph zoom level 2x.

4x Zoom––increases the graph zoom level 4x.

Btm (Bottom) Lock––sets the Bottom Lock (returns from the bottom up) picture. When using this setting, “BL” appears at the bottom of the screen.

•Zoom View—available when you select a Zoom scale other than Off. You can use the Zoom View setting to change the viewing range of a zoomed display. Auto follows the water bottom. If you select Bottom Lock, use the Span setting to adjust how far off the bottom the Fishfinder shows data.

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Fishfinder 340C Owner’s Manual