Garmin GPS 400 Pilot's Manual And Reference page 116

6
NRST PAGES
Nearest Airspaces
• If you are within two nautical miles of an airspace and your current
course will take you inside, the message "Airspace near and ahead"
will appear. The nearest airspace page will show "Within 2nm of
airspace".
• If you are within two nautical miles of an airspace and your current
course will not take you inside, the message "Near airspace less than
2nm" will appear. The nearest airspace page will show the airspace as
"Ahead < 2nm".
• If you have entered an airspace, the message "Inside Airspace" will
appear. The nearest airspace page will show "Inside of airspace".
Note that the airspace alerts are based on three-dimensional data (latitude, lon-
gitude and altitude) to avoid nuisance alerts. The alert boundaries for controlled
airspace are also sectorized to provide complete information on any nearby air-
space. Once one of the described conditions exists, the message annunciator will
flash, alerting you of an airspace message.
To view an airspace alert message:
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Once you have been provided an airspace alert message, detailed information
concerning the specific airspace is provided on the nearest airspace page. The
nearest airspace page displays the airspace name, status ("Ahead", "Ahead < 2nm",
etc. as described above), and a time to entry (if applicable). By selecting any air-
space name listed on the nearest airspace page, additional details will be provid-
ed—including controlling agency, communication frequencies and floor/ceiling
limits.
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