Vertical Speed Mode (Vs) - Garmin GFC 600 Pilot's Manual

AFCS
The Altitude Preselect function on a Garmin PFD allows the pilot to adjust the altitude
bug to a target Selected Altitude for the AFCS to intercept, capture, and subsequently
track in Altitude Hold mode.
The GMC 605 will annunciate 'ALTS' as the armed vertical mode while the active
vertical mode is PIT, VS, IAS, or GA.
As the aircraft nears the Selected Altitude, the AFCS automatically transitions to
Selected Altitude Capture mode with Altitude Hold mode armed. This automatic
transition is indicated by the 'ALTS' annunciation flashing for up to 10 seconds and the
appearance of the 'ALT' annunciation. The Selected Altitude is shown as the Altitude
Reference.
At 50 feet from the Selected Altitude, the AFCS automatically transitions from
Selected Altitude Capture to Altitude Hold mode and holds the reference altitude. As
Altitude Hold mode becomes active, the 'ALT' annunciation moves to the active vertical
mode field and flashes for 10 seconds to indicate the automatic transition.
Changing the Selected Altitude on the PFD while Selected Altitude Capture mode
is active causes the AFCS to revert to Pitch Hold mode with Selected Altitude Capture
mode armed for the new Selected Altitude.

VERTICAL SPEED MODE (VS)

Vertical Speed mode is selected by pressing the VS key. This mode acquires and
maintains a Vertical Speed Reference. The Vertical Speed Reference may be changed
by using the NOSE UP/DN wheel. The vertical speed reference can also be adjusted
by pressing the CWS button, hand-flying the aircraft to establish a new vertical speed,
and then releasing the CWS button. If the Selected Altitude Capture mode is available
in this aircraft, this mode may be used for climb or descent to the Selected Altitude
since Selected Altitude Capture mode is automatically armed when Vertical Speed
mode is selected.
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GMC 605 Annunciating Selected Altitude Capture Mode
Garmin GFC 600 Pilot's Guide 190-01488-00 Rev. B