Garmin G500H Pilot's Manual page 74

2) RAD ALT only altitude alert, pilot selectable.
• The alerting value is defaulted ON with a setting of 200 feet.
• The pilot can select alerts ON or OFF, and select the alert altitude based
on radar altitude.
• The alert upon descending through the selected altitude is a unique
tone.
• The altitude required to arm the alerting is 50 feet above the selected
altitude.
Additionally, the unit may be configured by the installer for the following alerts.
• An aural "One Hundred Feet" alert is always provided when descending
through 100 ft radar altitude.
• An alert will arm as soon as the radar altitude is above 100 feet.
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Garmin G500H Pilot's Guide 190-01150-02 Rev. J