Garmin GPS 400 Pilot's Manual And Reference page 65

Not all approaches in the database are approved for GPS use. As
you select an approach, a "
procedure name indicates the procedure can be flown using the
GPS receiver. Some procedures will not have this designation,
meaning the GPS receiver may be used for supplemental navigation guidance only.
ILS approaches, for example, must be flown by tuning the external VOR/ILS receiv-
er to the proper frequency and using the external CDI (or HSI) for guidance.
Once an approach is selected, it may be activated for navigation from the proce-
dures page. Activating the approach overrides the "enroute" portion of the active
flight plan, proceeding directly to the "approach" portion (for a full approach, directly
to the initial approach fix). Activating the approach also initiates automatic CDI scal-
ing transition as the approach progresses.
To activate an approach:
Another procedures page option allows you to activate the final course segment of
the approach. This option assumes you will receive vectors to the final approach fix
(FAF) and guides you to intercept the final course, before reaching the FAF.
To activate the approach, with vectors to final:
In many cases, it may be easiest to "Load" the full approach while still some dis-
tance away, enroute to the destination airport. Later, if vectored to final, use the
steps above to select "Activate Vector-To-Final"—which makes the inbound course to
the FAF waypoint active. Otherwise, activate the full approach using the "Activate
Approach?" option.
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PROCEDURES
Activating
Approaches
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