Garmin GPSMAP 498C Owner's Manual - Page 83
Using the Sonar Adjustment Menu, To select an adjustment option from the Sonar
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Using the Sonar Adjustment Menu The Sonar Adjustment menu gives you direct access to the settings and features most commonly used on the Sonar Page. The option selected currently appears in the upper-left corner of the screen. Press ADJ/MENU to see a list of all options and their current settings. To select an adjustment option from the Sonar Page: 1. Press the ROCKER left or right to scroll through the options in the upper-left corner of the screen. 2. Press ENTER to access the option's adjustment window. OR 1. Press ADJ/MENU. A list of all options and their current settings appears, with the selected option highlighted. GPSMAP 392/398/492/498 Owner's Manual USING SONAR > SONAR PAGE 2. Press up or down on the ROCKER to select the option, and press ENTER to access the adjustment window. 3. To exit any of the adjustment options, press QUIT. To change a Sonar Adjustment menu setting: 1. Select an adjustment option to change using one of the two methods described previously. The adjustment window automatically times out and disappears when the unit is idle for 20 seconds. 2. Press the ROCKER up or down to place the map pointer or setting bar at the setting, range, or percentage (Off, 1-100%). 3. Press ENTER or QUIT to exit the adjustment window, or press left or right on the ROCKER to view another adjustment window. Range-sets the screen depth range used for viewing. The unit can be set to automatically track the bottom or set to a user-specified depth range. Auto mode shows the most information possible while continuously showing the bottom. Gain-controls the sensitivity of the sonar receiver. Auto (default) is the recommended setting. It automatically sets the sonar sensitivity. You can also set the gain manually. To see more detail on the screen, increase the receiver sensitivity by selecting a higher gain. If there is too much detail or if the screen is cluttered, lower the sensitivity (lower the gain) to increase the clarity of the screen. 75