Lowrance HDS-9 Gen3 Operators Manual US - Page 84
Look Ahead, Contrast, Palettes, View, Stop sonar, Noise rejection, Position adjustment
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surface clutter by decreasing the sensitivity of the receiver near the surface. Noise rejection Signal interference from bilge pumps, engine vibration and air bubbles can clutter the sonar screen. The noise rejection option filters the signal interference and reduces on-screen clutter. Log sonar You can Log sonar data and save the file internally in the HDS Gen3 unit, or onto a microSD card as described in "Recording Sonar data" on page 68. Position adjustment You must align the SpotlightScan image with the direction the motor is pointing. Refer to "Aligning the SpotlightScan image" on page 83. Look Ahead You can make the top half of the image predominant on the display, for a better view of what is in front of you. Select Advanced and then Look Ahead menu options in the Structure menu to toggle it on and off. Contrast The contrast determines the brightness ratio between light and dark areas of the screen. This makes it easier to distinguish object from the background. Palettes You can select between several display palettes optimized for a variety of fishing conditions. View You can select between SpotlightScan and DownScan. Stop sonar Pauses the sonar. Re-select to restart the sonar. 84 SpotlightScan | HDS Gen3 Operator Manual