course line connections, are commanded by the FMS.
The active waypoint and course line are drawn in
magenta. Other symbols and lines are drawn in white.
If the rho-theta location of a waypoint lies off the
displayable map area a course line is drawn to the
edge of the display. All the waypoints that lie after that
waypoint are not connected with course lines. If VOR
is selected as the course source, bearing lines are
drawn on the map instead of course lines.
j. Course Source Failure. When the selected
course source sensor failure is detected, the sensor
annunciator becomes red and boxed and all symbols
and course lines are removed from the display. If the
course source goes invalid, the selected course
readout is replaced with red dashes. If a heading
source fails, all NAV information is removed from the
Figure 3B-10. Map ARC Format