Furuno FM-4000 Owner's Manual page 67

13. Turn the CHANNEL selector knob to select the
method of the time adjustment between "Automatic
and "Manual
Manual Manual
Manual." Manual
14. Press the [ ENT ] key to store the selected setting.
15. To exit this menu and return to radio operation mode, press the [ 16/9 ] key.
FM-4000
Automatic Automatic
Automatic Automatic"
Page 67