Pentax ETH-310 - Manual (Page 19)

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2.3.4 [0SET] key
Press the [0SET] key twice in succession to reset the displayed
horizontal angle 0°,00’,00”. (Press once, the key buzzer will sound,
then press again during the sound.)
Press the key once more to release.
To prevent operation error, the buzzer sounds for three seconds when
the [OSET] key is pressed.
[OSET] is not initiated unless the key is pressed during the buzzer
sound.
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