Garmin GNC 250 - Manual (Page 67)

All SUA alert messages except for prohibited areas may be turned on or off
through the GNC 250’s unit settings options, found under the MSG key (see page
77). Alerts for prohibited areas will always be displayed, regardless of unit settings or
operating mode. SUA alerts may be turned off so the pilot can avoid continuous alerts
in areas with extensive special use airspace.
Important: Turning off the SUA alerts only stops the display of SUA messages.
Any applicable SUA alert pages will still be available from the NRST key.
The GNC 250 also features an altitude buffer which may be set to provide a
greater level of protection from penetrating an SUA. By specifying an altitude in the
buffer, you can effectively stretch an SUA’s altitude boundaries in both directions. This
allows the pilot to add an extra margin of prevention around controlled or restricted
airspace. For instructions on setting the altitude buffer, see page 77.
57
APPENDIX A
Unit Settings List
SUA Settings Page
SECTION
4
NRST KEY
Special
Use Airspace
Altitude buffer set at 500 feet.
250 real 7/14/98 9:32 AM Page 57