Instruction Manual

The TO/FROM arrow indicates whether you are
heading to (an up arrow) the waypoint or if
you’ve passed the waypoint (a down arrow).
‘No active waypoint’ appears on the CDI field if
there is no destination waypoint selected using the
D key and no active route.
The GNC 300XL’s CDI page provides you with the important information needed
to navigate directly to your destination. The destination field, located at the bottom
left of the page, displays the current destination waypoint or active route leg being
navigated. If no direct-to destination, route or approach is being navigated, the desti-
nation field will remain blank.
The graphical CDI (course deviation indicator) at the top left of the page shows
your position relative to the desired course (the moving D-bar) to the destination
waypoint. The TO/FROM arrow in the center of the scale indicates whether you are
heading to (an up arrow) the waypoint or if you have passed the waypoint (a down
arrow). Note that the GNC 300XL always navigates TO a waypoint unless the GPS
SEQ switch is set to the HOLD position, or you have passed the last waypoint in a
route. The default setting of the CDI scale is ‘auto’. If you are not navigating to a des-
tination, the CDI field will display a ‘no actv wpt’ message, and only speed and track
data will be available. The CDI field is also used to display the GNC 300XL’s turn
anticipation and waypoint alert data during route operations (see Section 5).
In addition to displaying your active destination and the course deviation scale,
the CDI page features four selectable fields for various distance, direction and time
options. This allows you to configure the CDI page to your preferences. The default
settings are ground speed, distance, desired track and estimated time en route.
12
Active Waypoint
Ground Speed
Direction
Field
Distance
Field
Messages
or CDI
Time or Direction Field
SECTION
1
NAV KEY
CDI Page
300xl manual 1/25/99 2:35 PM Page 12