Section 925
GARMIN GNC 420W
Page Date: 31. March 2009
925 - 7
Pilot´s Operating Handbook
EXTRA 300L
The small right knob (CRSR) is used to select between the various pages within one of the groups
listed above. Press this knob momentarily to display the on-screen cursor. The cursor allows you
to enter data and/or make a selection from a list of options.
BOTTOM ROW KEYS
The nearest (NRST) key displays the nearest airports page. Then, turning the small right knob steps
through the NRST pages.
The OBS key is used to select manual or automatic sequencing of waypoints. Pressing the OBS
key selects OBS mode, which will retain the current „active to“ waypoint as your navigation
reference even after passing the waypoint (i.e., prevents sequencing to the next waypoint). Pressing
the OBS key again will return to normal operation, with automatic sequencing of waypoints.
Whenever OBS mode is selected, you may set the desired course to/from a waypoint using the
OBS Page, or an external OBS selector on your HSI or CDI.
The message key (MSG) is used to view system messages and important warnings and
requirements.
The flight plan key (FPL) allows you to create, edit, activate and invert flight plans, as well as access
approaches, departures and arrivals. A closest point to flight plan feature is also available from the
flight plan key.
N O T E
Whenever the GNC 420W is displaying a list of information that is too long for the
display screen, a scroll bar will appear along the right-hand side of the display. The
scroll bar graphically indicates the number of additional items available within the
selected category. Simply press the small right knob to activate the cursor and turn
the large right knob to scroll through the list.
The procedures key (PROC) allows you to select and remove approaches, departures and arrivals
from your flight plan. When using a flight plan, available procedures for your departure and/or arrival
airport are offered automatically. Otherwise, you may select the desired airport, then the desired
procedure.
POWERING UP THE GNC 420W
The GNC 420W power and COM volume are controlled using the power/volume knob at the top left
corner of the unit. Turning it clockwise will turn unit power on and increase the COM radio volume.
After turning the unit on, a
welcome page
will be displayed while the unit performs a self test, followed
by the database confirmation pages which show the current database information on the NavData
card (with the valid operating dates, cycle number and database type indicated). The database is
updated every 28 days, and must be current for instrument approach operations. Information on
database subscriptions is available inside your GNC 420W package.
To acknowledge the database information, press ENT.
Summary of Contents for 300L
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