Garmin GPSMAP 392, 398, 492, 498 Owner's Manual

Also see for GPSMAP 392, 398, 492, 498: Quick reference guide Specifications

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74 GPSMAP 392/398/492/498 Owner’s ManualU SING SONAR > SONAR PAGEAt the top of the screen, you might see a grouping of intense colors.This area is surface clutter, which can be caused by waves or anyother sonar interference at the surface of the water. Too muchsurface clutter can obscure your view of fish. You can turn downthe Gain setting to reduce this surface clutter.Between the bottom and the surface clutter, the fish appear asarches. Actual fish returns might not always appear as perfectarches, due to the speed, fish orientation, or other conditions. Youcan turn on the Fish Symbols setting if you want to see on-screenfish in a fish shape.Sonar PageThe Sonar Page is where your GPSMAP 392/398/492/498 becomesa powerful fishfinder/flasher. To view the Sonar Page, press PAGErepeatedly until it shows. Fish are shown as colored arches or asfish icons. Thermoclines are shown as shades of blue. The sonarfunction window contains a right-to-left moving sonar image ofthe water beneath your boat. Items appear as they pass under thetransducer. The most recent data is shown on the right side of thescreen. The right side of the screen contains a scale reflecting thedepth of the area being shown. The top-left corner shows the depth,water temperature, and speed through water (if equipped with atemperature or speed sensor).Use the Fish Symbols option to view the actual sonar data, fishsymbols, or a combination of both. Fish symbols appear as red.You can set the sonar display to show a split screen view of azoomed portion of the sonar, split frequencies, bottom lock (displayscaled from the bottom up) or a combination of these options. Forexample, you can choose to show dual frequency at a 2X zoom(Dual 2X) on one half and normal range dual frequency (Dual)returns on the other half. The display mode appears at the bottomof each sonar display.Sonar PageAdjustmentmenu