Garmin Cessna Caravan G1000 Cockpit Reference Manual page 36

GPS Navigation
Altitudes associated with approach procedures are "auto-designated". This means
the system will automatically use the altitudes loaded with the approach for giving
vertical speed and deviation guidance. Note these altitudes are displayed as light blue
text 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.
Altitudes associated with arrival procedures are "manually-designated". This means
the system will not use the altitudes loaded with the arrival for giving vertical speed
and deviation guidance until designated to do so by the pilot. Note that these altitudes
are initially displayed as white text. These altitudes may be "designated" by placing
the cursor over the desired altitude and pressing the ENT Key. After designation, the
text changes to light blue.
Altitudes that have been designated for use in vertical guidance may also be made
"non-designated" by placing the cursor over the desired altitude and pressing the CLR
Key. The altitude is now displayed only as a reference. It will not be used to give
vertical guidance. Other displayed altitudes may change due to re-calculations or
rendered invalid as a result of manually changing an altitude to a non-designated
altitude.
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Garmin G1000 Cockpit Reference Guide for the Cessna Caravan
190-00748-00 Rev. C