Cessna 172SPHUSR05 Pilot Operating Handbook page 321

CESSNA
MODEL 1 725
6. NAV/GPS SWITCH -- Toggles from Nav 1 to G PS and vice
versa to control the type of navigation data to be d isplayed on
the COl (Course Deviation Indicator). The
Bearing Selector (OBS) provides analog cou rse i nput to the
KLN 89B
switch/ann u nciator is i n G PS.
ann unciation is in NAV, G PS course selection in OBS mode is
digital through the use of the controls and display at the KLN
898.
Manual COl course centering in OBS mode using the
control
distances.
(COl) needle can best be accomplished by pressing the
Direct-To button and then manually setting the
COl course to the course value prescribed i n the KLN
898 displayed mes· s age.
The Directional Gyro heading (HOG) bug must also be
set to provide proper course datum to the autopilot if
coupled to the KLN 898 in
optional HSI is i nstalled, the HSI course pointer provides
course datum to the autopilot.)
7. NAVIGATION SOURCE (NAV) ANN UNCIATOR -- The NAV
ann unciator wil l illuminate steady to i nform the pilot that NAV
1 information is being d isplayed on the NAV 1 COL
8. NAVIGATION SOURCE (GPS) AN N U NCIATOR -- The G PS
ann unciator wil l illuminate steady to inform the pilot that GPS
i nformation is being d isplayed on the NAV 1 COl.
Figure 1 . G PS Annunciator/Switch (Sheet 3 of 3)
May 2 1 /99
SUPPLEMENT 5 - FAA APPROVED
in OBS
NOTE
knob can be difficult,
Centering the Course Deviation Indicator
NOTE
SECTION 9 - SUPPLEMENTS
mode when
When the NAV/GPS switch
especially at long
or
No. 1 COl Omni
the
NAV/GPS
No. 1
(When the
1
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