Garmin GTS 820 TAS Pilot's Manual page 26

6.4.1.1.2 Landing Gear Position
If the aircraft has retractable landing gear, SL A will be used when the landing
gear is extended. SL B will be used when the landing gear is retracted. Landing
gear position does not affect sensitivity level if height above ground is available.
6.4.1.1.3 Groundspeed
GPS groundspeed may be used to select the sensitivity level only if height
above ground and landing gear position is not available. SL A will be used when
the groundspeed is less than 120 knots. SL B will be used when the groundspeed
is greater than 120 knots.
6.4.1.1.4 No Available Inputs
If none of the above inputs are available (radar altimeter, calculated height
above ground, landing gear position, or groundspeed), the system will always
remain in the most sensitive level, SL B.
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Garmin GTS Traffic Systems 190-00587-02 Rev. E