GPS 400 Pilot’s Guide and Reference
190-00140-60 Rev. H
1-16
SECTION 1
INTRODUCTION
Nearest (NRST) Airspace Page
The last page in the NRST Page Group, the Nearest
Airspace Page (Figure 1-27), provides information for
up to nine controlled or special-use airspaces near or in
the flight path.
Airspace information appears on this
page based on the same criteria used for airspace alert
messages:
• If the projected course will take the aircraft inside
an airspace within the next ten minutes, the
message ‘Airspace ahead -- less than 10 minutes’
appears.
• If the aircraft is within 2 nm of an airspace and
the current course will take the aircraft inside, the
message ‘Airspace near and ahead’ appears.
• If the aircraft is within 2 nm of an airspace and
the current course will not take the aircraft inside,
the message ‘Near airspace less than 2nm’ appears.
• If the aircraft has entered an airspace, the message
‘Inside airspace’ appears.
Figure 1-27 Nearest Airspace Page
By default, airspace alert messages are turned off.
When turned on, the message (MSG)
annunciator located
directly above the
MSG
Key flashes to alert the pilot to
the airspace message. See Section 8.4, Setup 1 Page:
Airspace Alarms for information on enabling
airspace alert
messages.
Viewing an airspace alert message:
1) Press the
MSG
Key. The Messages Page appears
with the alert message (Figure 1-28).
Figure 1-28 Message Page
2) Press the
MSG
Key again to return to the
previous display.
Note that the airspace alerts are based upon three-
dimensional data (latitude, longitude, and altitude) to
avoid nuisance alerts. The alert boundaries for controlled
airspace are also sectorized to provide complete information
on any nearby airspace. Additional information about a
nearby airspace (such as controlling agency, frequency, and
floor/ceiling limits) is available from the Nearest Airspace
Page (Section 7.9).
Viewing additional airspace information:
1) Press the small
right
knob to activate the
cursor.
2) Turn the large
right
knob to select the desired
airspace from the list.
3) Press the
ENT
Key to view the airspace
information.
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