Garmin Fishfinder 250 Owner's Manual

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Garmin Fishfinder 250 Owner's Manual Manual pdf 22 page image

14• Whiteline — controls how the unit displays information about the bottom type (hard or soft). Withthe Whiteline ‘Off’, all high-intensity bottom returns are displayed as red on the Fishfinder 250C and blackon 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 thesound that the transducer sends and receives. You may choose ‘200kHz’, ‘50kHz’ or ‘Dual’ frequency (whenusing a dual frequency transducer).• Depth Line — adds a horizontal depth line across the display to measure the depth of underwaterobjects. 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 thegraph.• 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: theHIGHER 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 ismoving too fast, slowing the scroll rate or pausing it can be beneficial. ‘Auto’ automatically adjusts the scrollrate 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 availablewhen a split zoom is selected. You may adjust the size of the split window anywhere from 1/4 to 3/4 widthfrom 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 isdisplayed 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.Resizing the Sonar SplitUnit OperationAdjustment Menu OptionsYou mayresize the splitline to the leftor right.The current frequency setting willdisplay at the bottom of the screen.