Garmin GFC 600H Pilot's Manual page 40

HFCS
Selecting Glidepath Mode:
1) EXTERNAL NAVIGATOR: Ensure a GPS approach with vertical guidance
(LPV, LNAV/VNAV, LNAV+V, LP+V) is loaded into the active flight plan.
2) Ensure that GPS is the selected navigation source on the HSI.
3) GMC 605H: Press the APR key. The HFCS maintains the current mode but
arms Glidepath mode. If the current vertical mode is ATT then IAS mode
will become the active mode with GP armed.
4) Upon reaching the glidepath, the HFCS vertical mode transitions to
Glidepath Mode and begins to capture and track the glidepath.
Once the following conditions have been met, the glidepath can be captured:
• GPS must be the active lateral mode.
• Vertical deviation is valid.
• The CDI is at less than full-scale deviation.
• Automatic sequencing of waypoints has not been suspended (no 'SUSP'
annunciation on the HSI).
• Must be captured from below the glidepath.
Some RNAV (GPS) approaches provide a vertical descent angle
NOTE:
as an aid in flying a stabilized approach. These approaches are NOT
considered Approaches with Vertical Guidance (APV). Approaches that are
annunciated on the HSI as LNAV or LNAV+V are considered Nonprecision
Approaches (NPA) and are flown to an MDA even though vertical glidepath
(GP) information may be provided and the HFCS will capture and track the
vertical guidance.
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Garmin GFC 600H Pilot's Guide 190-02081-04 Rev. A