Garmin G1000 Cockpit Reference Manual page 38

GPS Navigation
Since altitudes loaded with an arrival procedure are published only for turbojet
aircraft, the altitudes are displayed as white text indicating that the altitudes are
displayed for reference only. An arrival waypoint altitude may be used (or "designated")
as is, or changed to a different altitude. An altitude is designated by pressing the FMS
Knob and turning the large FMS Knob to place the cursor on the desired altitude and
pressing the ENT Key, or by entering a different value and pressing the ENT Key. The
altitude is now displayed as blue text, indicating that the altitude is now designated to
give vertical speed and deviation guidance.
Approach waypoint altitude constraints are designated in the same way as
previously described for arrivals. These altitudes are also displayed as blue text after
being designated for use. Waypoint altitude constraints may be designated up to, but
not including the FAF. The FAF is always a "reference only" altitude and cannot be
designated, unless the selected approach does not provide vertical guidance. In this
case, the FAF altitude can be designated.
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Garmin G1000 Cockpit Reference Guide for the Quest KODIAK 100
190-00645-07 Rev. A
™