Operation Manual

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iii. Press the Up/Down  (Y) / (N) button to check  Enable or
leave it blank.
iv. Press the OK  button to confirm and return to the Alert Menu.
Note: Altitude must be set within the range of 1 to 9999 (m).
Reset Alert
You may also reset alert by selecting Reset Alert from the Alert
submenu:
1. Select Reset Alert.
2. Press the OK button to confirm.