Garmin GFC 600 Pilot's Manual page 34

AFCS
The pilot must add power to increase airspeed. If the aircraft was in PIT or VS mode
prior to entering Underspeed Protection and full power has already been applied,
the pilot can move the NOSE UP/DN wheel in the DN direction to reduce the pitch
attitude or vertical speed reference.
When airspeed increases to 5 KIAS above the minimum speed, the MINSPEED
message will be removed and the armed vertical Flight Director mode will change back
to active. The autopilot will resume tracking the previously selected vertical reference.
When the AFCS is outside normal operating limits, it uses more
NOTE:
aggressive commands to return to normal limits.
26
GMC 605 Underspeed Indication
(Non-Altitude Critical Mode)
GI 285 Underspeed Indication
(Non-Altitude Critical Mode)
Garmin GFC 600 Pilot's Guide 190-01488-00 Rev. B