Garmin GNC 420 Pilot's Manual & Reference page 176

APPENDIX
D
TROUBLE-
SHOOTING
What happens when I select an approach? Can I store a flight plan with an approach, departure or arrival?
Whenever you load an approach, departure or arrival into the active flight plan, a set of approach,
departure or arrival waypoints is inserted into the flight plan—along with a header line describing the
instrument procedure you selected. The original en route portion of the flight plan will remain active,
unless you "activate" the instrument procedure; which may be done when the procedure is loaded or
at a later time.
Flight plans can also be stored with an approach, departure or arrival. Keep in mind that the active
flight plan is erased when the unit is turned off and overwritten when another flight plan is activated.
When storing flight plans with an approach, departure or arrival, the GNC 420 will use the waypoint
information from the current database to define the waypoints. If the database is changed or updated, the GNC 420 will automatically update the
information if the procedure has not been modified. If an approach, departure or arrival procedure is no longer available, the flight plan will become
locked until the procedure is deleted from the flight plan or the correct database is installed. For information on loading an approach, departure or
arrival, see page 66. See page 57 for instructions on saving and copying flight plans.
Can I file slant Golf ("/G") using my GPS?
Yes, you may file your flight plan as /G if your GNC 420 is a certified A1 or A2 installation. If you are flying en route, you may file /G with an
expired database only after you have verified all route waypoints. Non-precision approaches may not be flown with an expired database. See your
approved Airplane Flight Manual Supplement for more information.
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Why aren't there any approaches
available for my flight plan?
Approaches are available for the final destination
airport in a flight plan or as a direct-to (keep in mind
that some VOR/VORTAC identifiers are similar to
airport identifiers). If a destination airport does not
have a GPS approach, the GNC 420 will indicate
"NONE" for the available procedures—as listed on
the airport approach page. For more information on selecting an approach, see page 66.