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P/N 11934-S22 5 of 10
Cirrus Design Section 9
SR20 Supplements
The Navigator will display a welcome page while the self-test is in
progress. When the self test is successfully completed, the
Navigator asks for NavData database confirmation, acquires
position, and then displays the acquired position on the
Navigator’s display and on the MFD.
• Note •
The Navigator is not coupled to an air and fuel data computer.
Manual fuel-on-board and fuel flow entries must be made in
order to use the fuel planning function of the AUX pages.
The GPS Navigator utilizes altitude information from the
altitude encoder’s altitude digitizer to enhance altitude
information.
GNS 430 Integration
The GNS 430 Navigator is integrated into the SR20 Avionics
installation in three configurations:
1. Single GARMIN GNS 430 (GPS 1) interfaced with the CDI and
MFD and a single GARMIN GNC 250XL (GPS 2) not integrated
with a remote indicator.
a. In this configuration, pressing the alternate-action CDI pushbutton
on the GARMIN GNS 430 (GPS 1) alternately selects
GPS or NAV for display on the CDI each time the button is
pressed. The CDI source is indicated by illumination of the
“GPS” or “VLOC” annunciation in the lower left corner of the
GNS 430 display.
• Note •
The CDI displays course deviation from a VOR, Localizer
(LOC) or Glideslope (G/S) when VLOC is selected for
display and displays GPS track deviation when GPS is
the selected navigation source.
b. GPS 2 in this configuration is a GARMIN GNC 250XL GPS
Navigator with VHF Com. This unit displays GPS data on the
unit’s display panel only and is not integrated with any remote
indicator. Refer to the SR20 POH Supplement for GARMIN
GNC 250XL GPS Navigator, P/N 11934-S05.
Revision 02: 08-15-07
6 of 10 P/N 11934-S22
Section 9 Cirrus Design
Supplements SR20
2. Single GARMIN GNS 430 (GPS 1) interfaced with the HSI and
MFD and a single GARMIN GNC 420 (GPS 2) interfaced with the
CDI (VOR/LOC) indicator.
a. In this configuration, pressing the alternate-action CDI pushbutton
on the GARMIN GNS 430 (GPS 1) alternately selects
GPS or NAV for display on the HSI and MFD each time the
button is pressed. The HSI source is indicated by illumination
of the “GPS” or “VLOC” annunciation in the lower left corner of
the GNS 430 display.
• Note •
The HSI displays course deviation from a VOR, Localizer
(LOC), or Glideslope (G/S) when VLOC is the navigation
source and displays GPS track deviation when GPS is
the selected navigation source.
b. GPS 2 in this configuration is a GARMIN GNC 420 GPS
Navigator interfaced with the CDI (VOR/LOC Indicator). This
unit displays GPS data on the unit’s display panel and on the
remote CDI (VOR/LOC Indicator). Refer to the SR20 POH
Supplement for GARMIN GNC 420 GPS Navigator, P/N
11934-S23.
3. Dual GARMIN GNS 430 units are installed. GPS 1 in this
configuration is the uppermost GNS 430 unit in the console and
GPS 2 is the lower GNS 430 unit.
a. GPS 1 in this configuration is a GARMIN GNS 430 GPS
Navigator with VHF Com interfaced with the HSI and MFD.
Pressing the alternate-action CDI push-button on GPS 1
alternately selects GPS or NAV for display in the HSI and
MFD each time the button is depressed. The HSI source is
indicated by illumination of the “GPS” or “VLOC” annunciation
in the lower left corner of the GNS 430 display.
• Note •
The HSI displays course deviation from a VOR, Localizer
(LOC) or Glideslope (G/S) when VLOC is the navigation
source and displays GPS track deviation when GPS is
the selected navigation source.
Revision 02: 08-15-07
P/N 11934-S22 7 of 10
Cirrus Design Section 9
SR20 Supplements
b. GPS 2 in this configuration is a GARMIN GNS 430 GPS
Navigator with VHF Com interfaced with the CDI (VOR/LOC/
ILS/GS Indicator). Pressing the alternate-action CDI pushbutton
on GPS 2 alternately selects GPS or NAV for display in
the CDI each time the button is depressed. The HSI source is
indicated by illumination of the “GPS” or “VLOC” annunciation
in the lower left corner of the GNS 430 display.
• Note •
The CDI displays course deviation from a VOR, Localizer
(LOC) or Glideslope (G/S) when VLOC is the navigation
source and displays GPS track deviation when GPS is
the selected navigation source.
Deactivate GPS
1. Navigator Com/ Power Switch .......................... Rotate CCW ‘OFF’
　
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