Garmin Fishfinder 90 Owner's Manual - Page 21

3. To select a setting, use the Arrow keys to move the selection arrow, and press ENTER. (When you reach the end of a menu, the selection arrow wraps to the beginning.) Press and hold an Arrow key to rapidly advance the selection speed. 4. To close a setting or a menu, press MENU. Using the Main Menu From the Main menu, you can change the Range, Gain, Scroll, Zoom, and View settings. • To view the current menu settings, press MENU. OPERATING YOUR FISHFINDER > USING THE MAIN MENU • To quickly change a setting for the current option that appears in the upper-left corner of the screen (for example, the Range option in the above screen), press an Arrow key. Options and Settings The following settings reset to the system defaults each time you turn on the Fishfinder. Range-sets the maximum depth that you want the Fishfinder to display. Auto (default) automatically tracks the bottom, or you can set the range, 5-600 feet. Gain-controls the sensitivity of the Fishfinder's sonar receiver. Auto (default) automatically sets the sonar sensitivity, or you can set the gain. 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. • To exit any window, press MENU. Fishfinder 90/140 Owner's Manual 15