Enabling the Screen Lock
To prevent unauthorized use of your device, you can enable the
Screen Lock feature, which requires a Personal Identification Number (PIN). When enabled, you must enter the PIN to unlock the screen each time you turn on the device.
If you enable the Screen Lock feature, Garmin® Support cannot retrieve the PIN or access your device. It is your responsibility to provide the PIN to anyone authorized to use the navigator.
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Select
> 
> Device > Screen Lock.
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Select an option:
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To enable the screen lock and set a new PIN, select Require PIN, and enter a PIN number.
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To change your PIN number, select Change PIN, and enter a PIN number.
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To disable the screen lock, clear the Require PIN check box.
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