General A3G Instruction Manual page 11

Tilt Alarm
‣ Once the unit has been levelled off the tilt alarm can be
enabled by pressing the tilt alarm button. The tilt alarm indicator light
will flash for approximately 15 seconds. Once the light is constant the
alarm is enabled.
‣ If the unit is disturbed while the alarm is active the unit will need to be
powered off and on again to reset its level position.
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