GNS 530(A) Pilot’s Guide and Reference 190-00181-00 Rev. E
1-18
SECTION 1
INTRODUCTION
Nearest (NRST) Airspace Page
The last page in the NRST group, the Nearest Airspace
Page (Figure 1-29), 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 it inside of the airspace,
the message ‘Airspace near and ahead’ appears.
• If the aircraft is within 2 nm of an airspace and
the current course will not take it inside of the air-
space, the message ‘Near airspace less than 2nm’
appears.
• If the aircraft has entered an airspace, the message
‘Inside airspace’ appears.
Figure 1-29 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 10.4, Setup 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
1-30).
Figure 1-30 Messages 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 8.9).
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.