Stopping The Buzzer; Changing The Display - JRC JLR-21 Instruction Manual

5.2.5 Stopping the Buzzer

Pressing the key silence the buzzer.
The buzzer sounds when one of the following occurs.
 Position measurement is interrupted
 Bearing measurement is interrupted
 An error occurs

5.2.6 Changing the Display

Each time the
5-8
key is pressed, the screen display changes. (Refer to "4.1 Display Screen")