Century 4000 Pilots Operating Manual page 15

Left/Right
Radio
Deviation
Meter
Glideslope
Flag
Glideslope
Pointer
Course Selector
Knob
Autopilot course information is derived from course needle position (direction) and left/right radio
information (deviation from desired radio track) to provide precise intercept and track capability.
NOTE
The Century 4000 is capable of using radio information provided by a loran or GPS. There are several
important factors to consider when using those units with the autopilot and HSI.
Because the HSI incorporates an integrated course/left-right display and an OBS resolver, a switching
device will be required in order for the HSI to display the selected information.
Most manufacturers of loran and GPS have the capability to adjust the course width (CDI sensitivity) of
their units. Course width is measured in nautical miles from full scale left to full-scale right deflection of
the CDI. If the course width is too wide, the autopilot will be insensitive to the movement of the CDI. If
the course width is too narrow, the autopilot will be overly responsive to the CDI movement.
For proper autopilot operation with a loran or GPS, the autopilot needs both direction and deviation.
Directional information is provided by the heading bug, if a DG is being used, or by the course needle,
when an HSI is being used. When a waypoint is called up, the loran or GPS will display a "desired track".
The heading bug or course arrow must match this "desired track". If you use multiple legs in a flight, you
must match the heading bug or course arrow with the new "desired track".
Lubber Line
Autopilot Heading
Bug
DC
NSD-1000
15
Heading Flag
Slaving
Meter
Course
Needle
NAV Flag
Heading Selector
Knob/Card Set