T-6A INSTRUMENT NAVIGATION
2. Full scale deflection on the course indication scale represents approximately 2 1/2° of LOC
3. The course indicator will display whether the aircraft is right or left of course regardless of
the course selected with the course set knob.
The CDI displays only whether the aircraft is on course or right or left of course based upon
signal information from a specific selected LOC transmitter. Therefore, always set the published
inbound front course of the ILS/LOC in the course selector window. This enables you to
interpret aircraft position through use of the course indicator in the same manner described for
VOR course and position determination.
The Glideslope Indicator (GSI) displays glideslope position in relation to the actual position of
the aircraft. For example, if the GSI bar is above the center of the gauge, the glideslope is above
the aircraft. Each of the four dots in the vertical row represents approximately 1/4° of deviation
from the glideslope.
ILS course and glideslope displays are reliable only if their
warning red X fail annunciations are not in view and the aural ILS
identification is being received.
The marker beacon light(s) on the course indicator indicate proximity to a 75 MHz marker
beacon (e.g., ILS OM or MM.) As the aircraft flies through the marker beacon signal pattern, the
light flashes in Morse Code indicating the type of beacon being over flown. The marker beacon
light is not used in conjunction with VOR or GPS approaches.
204. OTHER POSITION INSTRUMENTS
Modern naval aircraft are tending toward more sophisticated instruments for determining aircraft
position. Some of these systems include radar, inertial and GPS navigation, and computerized
visual displays. These systems are explained in appropriate NATOPS flight manuals.
2-6 INTRODUCTION TO AIRCRAFT FLIGHT INSTRUMENT