Gps Navigator - Garmin GNC 250XL Operating Handbook

Cirrus Design Section 9
SR20 Supplements
GNC 250XL Integrated GPS/NAV/COM System
This airplane is equipped with a GNC 250XL integrated GPS navigator
and COM receiver. The GPS navigator consists of a GPS receiver and
a Jeppesen NavData database all contained in the GNC 250XL
control unit mounted in the center console. The GPS is designated
'GPS 2.' Also integrated into the GNC 250XL control unit is a VHF
communications receiver, designated COM 2. All tuning and display
controls for the GPS and COM are located in the GNC 250XL control/
display in the center console. The following paragraphs describe the
GPS and COM functions of this unit. For a complete description, as
well as full operating instructions, refer to the Garmin GNC 250XL
Pilot's Guide and Reference.

GPS Navigator

The Garmin GNC 250XL GPS navigator provides backup for the GNS
430 Navigator and is approved for VFR use only. The system utilizes
the Global Positioning System (GPS) satellite network to derive the
airplane's position (latitude, longitude, and altitude) and the altitude
digitizer to enhance the altitude calculation. The GPS antenna is
located on the underside of the glareshield behind the MFD. All GPS
navigator controls and functions are accessible through the GNC
250XL front control panel located in the center console. The panel
includes function keys, power switches, MSG and Nav status
annunciators, LCD display, two concentric selector knobs, and a
Jeppesen NavData card slot in each panel. The GNC 250XL navigator
is powered by 28 VDC through the 7.5-amp COM2 circuit breaker on
the Avionics Non-Essential Bus.
The Jeppesen Navigation Database provides access to data on
Airports, Approaches, Standard Instrument Departures (SIDs),
Standard Terminal Arrivals (STARs), VORs, NDBs, Intersections,
Minimum Safe Altitudes, Controlled Airspace Advisories and
Frequencies. North American and International databases are
available. Database information is provided on a card that can be
inserted into the card slot on the GPS unit. Subscription information is
provided in a subscription packet provided with each system.
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