Garmin CNX 80 Pilot's Manual page 106

Basic Operation
Procedures
98
4. As you approach the FAF, the GNS 480 will begin to automatically rescale in an angular fashion. This
will allow the LP approach to be flown in the same fashion as a standard localizer approach. At 2.0
nautical miles from the FAF, CDI scaling is tightened from either 2° or 1.0 to 0.3 nautical miles, full
scale deflection, whichever is smaller.
5. Sixty seconds prior to reaching the FAF, the GNS 480 will check the required Horizontal Alarm Limit
(HAL) to ensure the GPS position integrity is within limits to complete the LP non-precision approach.
In the event the HAL limits are exceeded, the approach will be downgraded, when available, indicated
by "Lnav" on the moving map, otherwise the approach will be aborted. A message will note that the
approach is downgraded and the NAV indicator will be flagged. You may continue the approach using
LNAV non-precision minimums if there are LNAV minimums for this approach. In the rare event the GPS
HAL limits cannot meet non-precision limits, the GNS 480 will notify the pilot with a message to abort
the approach. The GNS 480 will revert to terminal limits of 1.0 NM to support navigation to the missed
approach.
6. As you cross the FAF, the destination sequences to the MAP (the runway threshold). With the needle on
the external CDI (or HSI) centered, fly toward the MAP, observing the altitude minimums dictated by the
approach plate.
7. When viewing the Map Page, you'll note that the final course segment is displayed in magenta (the
active leg of the flight plan always appears in magenta).
8. As you approach the MAP, a waypoint message ("NEXT TRK xxx°") appears on the bottom of the
screen.
9. At the MAP initiate the missed approach, if necessary. Once the GNS 480 crosses the MAP (defined
as the runway end waypoint), the GNS 480 will automatically sequence to the first leg of the missed
approach.
NOTE: For missed approaches with heading legs, fly manually until the first active course leg is
reached, as described in earlier sections.
10. Fly the guidance provided by the GNS 480 to the MAHP and hold.