HFCS
The GMC 605H will annunciate 'ALTS' as the armed vertical mode while the active
vertical mode is VS or IAS.
Active
HFCS Status Annunciations on Garmin PFD (Altitude Select - ALTS Armed)
26
GMC 605H Altitude Select Indications (ALTS Armed)
Lateral Modes
Garmin GFC 600H Pilot's Guide
Coupled
Servo Status
Status
Vertical
Modes
Active
Armed
Selected
Altitude
190-02081-04 Rev. A