Garmin GNC 420W GPS Receiver User Manual


 
16
Activating an Approach
1. With an approach loaded
in the active flight plan,
press the PROC key to
display the procedures
page.
2. Turn the large right
knob to highlight “Activate Approach?”.
3. Press the ENT key.
Activating an Approach with Vectors-To-Final
The “Activate Vector-To-Final?” option allows you
to activate the final course segment of the approach.
This option assumes you will receive vectors to the final
approach course and guides you to intercept the final
course, before reaching the FAF.
1. With an approach loaded
in the active flight plan,
press the PROC key to
display the procedures
page.
2. Turn the large right
knob to highlight “Activate Vector-To-Final?”.
3. Press the ENT key.
Flying an Approach
Due to the variety of available approach procedures, the
specific steps required will vary according to the approach
selected. Keep the following general guidelines in mind
while flying the approach:
The 400W series is designed to complement your
printed approach plates and improve situational
awareness throughout the approach. However, you
must always fly an approach as it appears on the
approach plate.
You will typically select the destination airport as the
last waypoint in the active flight plan or by using the
direct-to key. Doing so ensures that the desired waypoint
will automatically appear when choosing the “Select
Approach?” option from the procedures page. Otherwise,
you must first choose the airport, then the approach
procedure.
• When a localizer-based approach (such as an ILS) is
loaded, the desired frequency is automatically placed in
standby on the VLOC window. To activate the frequency,
press the VLOC flip/flop key.
• If the VLOC receiver will be used for the approach, be
sure to switch the external CDI (or HSI) to “VLOC” by
pressing the CDI key. “VLOC” will appear directly above
the CDI key.
• An “Auto ILS CDI” setting provides automatic switching
to “VLOC” as you intercept the final approach course.
When the ILS approach is activated (and the correct
frequency is active in the VLOC window), the unit will
automatically switch within 1.2 nautical miles left or right
of the approach course. This switch can take place any-
where from 2.0 to 15.0 nautical miles from the FAF. The
switch occurs gradually to prevent abrupt CDI changes.
This does not occur automatically when configured for the
King KAP140/KFC225 autopilots as Auto ILS CDI Selection
is not allowed.
• As you progress to each approach waypoint, a waypoint
alert message (“NEXT DTK ###°”) will appear in the
lower right corner of the display.
• When you should begin a course change (via a standard
rate turn), turn advisories (“TURN TO ###°”) will appear
in the lower right corner of the display.
• For GPS-based approaches, receiver autonomous integ-
rity monitoring (RAIM) will monitor satellite conditions
and alert you—using an “INTEG” at the bottom left
corner of the display — if protection limits cannot be
APPROACHES