Cessna 172SPHUSR05 Pilot Operating Handbook page 433

C ESSNA
MODEL 1 72S
6. NAV/GPS SWITCH -- Toggles from Nav 1 to G PS and vice
versa to control the type of navigation data to be displayed on
the C O l (Cou rse Deviation Indicator). The
Bearing Selector (OBS) p rovides analog course input to the
KLN 94 in OBS m ode when the NAV/GPS switch/annunciator
is in G PS . When the NAV/GPS switch annunciation is in NAV,
G PS course selection in OBS mode is digital through the use
of the controls and display at the KLN 94.
Manual COl cou rse centering in OBS mode using the
control knob
distances.
(COl ) needle can best be accomplished by pressing the
Direct-To b utton and then manually setting the
C O l cou rse to the course value prescribed in the KLN 94
displayed message.
The Directional I ndicator heading (HOG) bug m ust also
be set to provide p roper course datum to the autopilot if
coupled to the KLN 94 in LEG or OBS.
optional HSI is i nstalled, the HSI course pointer provides
course datum to the autopilot.)
7. NAVIGATION SOURCE (NAV) ANNUNCIATOR -- The NAV
annunciator will illuminate steady to inform the pilot that NAV 1
information is being displayed on the NA V 1 COL
8 . NAVIGATION SOURCE (GPS) ANNUNCIATOR -- The G PS
annunciator will illuminate steady to inform the pilot that G PS
information is being displayed on the NA V 1 COl .
Figure 1 . GPS Annunciator/Switch (Serials 1 72S8372 thru
Jan 22/01
SUPPLEM ENT 1 9 - FAA APPROVED
NOTE
can be difficult,
Cente rin g the Course Deviation I ndicator
NOTE
1 72S8703) (Sheet 3 of 3)
SECTION 9 - SUPPLEMENTS
No. 1 COl Omni
especially at long
(When the
No. 1
S 1 R-R