Garmin GNS 430 Pilot Operating Handbook page 6

Section 9
Supplements
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 push-
button 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.
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.
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.
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Cirrus Design
SR20
P/N 11934-S22
Revision 2: 08-15-07