Cessna 172SPHUSR05 Pilot Operating Handbook page 434

SECTIO N 9 - SUPPLEMENTS
SUPPLE M ENT 1 9 - FAA APPROV E D
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1 . HSI ANN U NCIATOR LIGHT -- This label is present when the
optional HSI is installed.
cou rse datum to the autopilot.
2. NAVIGATION SOURCE (NAV) ANNUNCIATOR -- The NAV
ann unciator will illuminate steady to inform the pilot that NAV
1 information is being displayed on the NAV 1 COL
3. NAVIGATION SOU RCE (GPS) ANNUNCIATOR -- The G PS
annunciator wiii iiiuminate steady to inform the piiot that G PS
information is being displayed on the NAV 1 COL
4 . N AV/GPS SWITCH -- Toggles from Nav 1 to G PS and vice
versa to control the type of navigation data to be displayed on
the COl (Course Deviation Indicator). The
Bearing Selector (OBS) provides analog cou rse input to the
KLN 94 in OBS mode when the NAV/GPS switch/annunciator
is in GPS.
NAV, G PS course selection in OBS mode is digital through
the use of the controls and display at the KLN 94.
,
Figure 2. G PS Annunciator/Switch (Serials 1 72S8704 and On)
S1 9- 1 0
HSI
NAV
G PS
The HSI course pointer provides
When the N AV/GP S switch annunciation is in
(Sheet 1 of 2)
CESSNA
MODEL 1 72S
4
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No. 1 COl Omni