Unit Operation

Adjustment Menu Options

You may resize the split line to the left or right.

Resizing the Sonar Split

The current frequency setting will display at the bottom of the screen.

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•Whiteline — controls how the unit displays information about the bottom type (hard or soft). With the Whiteline ‘Off’, all high-intensity bottom returns are displayed as red on the Fishfinder 250C and black on the Fishfinder 250. With Whiteline set at ‘Normal’ or 1-100%, this option can be used to better deter- mine bottom hardness. See page 26 for more information on this feature.

•Frequency — allows you to choose a sonar operation frequency. Frequency refers to the “pitch” of the sound that the transducer sends and receives. You may choose ‘200kHz’, ‘50kHz’ or ‘Dual’ frequency (when using a dual frequency transducer).

•Depth Line — adds a horizontal depth line across the display to measure the depth of underwater objects. The depth of the line is displayed in a box on the right side of the line. When the Depth Line adjust- ment window is visible, press the UP or DOWN ARROW keys to control the position of the line on the graph.

•Noise Reject — helps filter unwanted noise from the graph. The ‘Noise Reject’ tool can be turned ‘Off’, set to ‘Normal’ (automatically adjusts for optimum viewing) or to a fixed 1-100% setting. NOTE: the HIGHER the noise rejection setting, the more likely the unit is to NOT show fish or structure.

•Scroll — adjusts the rate that the graph scrolls from right to left. If you are sitting still or the graph is moving too fast, slowing the scroll rate or pausing it can be beneficial. ‘Auto’ automatically adjusts the scroll rate according to the boat’s speed. (See also ‘Automatic Scroll Speed Limit’ on page 21.)

•Size Split — enables width adjustment of the Sonar Page split screen. This option is only available when a split zoom is selected. You may adjust the size of the split window anywhere from 1/4 to 3/4 width from the right half of the Sonar Page.

To resize the Sonar Page split screen:

1.From the Sonar Page split screen, press ADJ/MENU.

2.Using the ARROW keys, highlight the ‘Size Split’ option and press ENTER. A small double-arrow is displayed in the middle of the split line on the screen.

3.Press the LEFT or RIGHT ARROW keys to move the split line to the desired position, then press ENTER.

•Defaults — restores Adjustment Options back to original factory settings.