Furuno LH-5000 Operator's Manual page 39

LH-5000 Operator's Manual
Press the Down key to select "ON" and press the ENT key.
Step 3
The BOTH key glows red every four second, and the following
information appears on the screen. Countdown will start.
After five minutes, the LH-5000 goes to "STAND BY" mode. Then
it sounds alarm tone loudly for two minutes, and then pauses for five
minutes. This cycle is repeated continuously.
Also the following information appears on the screen.
Disabling the alarm mode
Press any key except ENT, Up, or Down key on the front panel to exit the
alarm mode.
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Operation Overview