Furuno FE-800 - Bottom Lost

2. SYSTEM MENU
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2.7.3 Bottom lost
When the bottom echo is lost, the audible alarm sounds and the alarm message is displayed in
the alert display area at the bottom of the screen.
Note: The alarm code may be displayed with only the final three digits, depending on the Alarm
Mode selected.
To adjust the alert settings, do the following:
1. Press the MENU/ESC key to open the Main menu.
2. Select [System] using  or , then press the ENT key.
3. Select [Alert] using  or , then press the ENT key.
4. Select [Bottom Lost] using  or , then press the ENT key.
5. Select [ON] to output an alert, select [OFF] to stop alert output.
6. Press the DISP key to close the open menus.