TM 1-1510-218-10 3C-34 If  an  FMS  is  attached  to  the  MFD,  a  waypoint alert  occurs  when  the  aircraft  is  about  to  reach  the active    waypoint.        The    active    waypoint    flashes    to indicate a waypoint alert. i.    Active    Flight    Plan    and    Other    Course Sources.       If   FMS   is   the   selected   course   source, waypoint  symbols  are  connected  together  by  course lines   of   solid   magenta   ARC's,   unless   a   gap   in   the course  line  connections  is  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 display. k.   FMS-800  Map  Display  Operation.  Refer to Table 3C-8 for display options. Table 3C-8.  FMS-800 Map Display Operation MAP MODE PREVIOUS WAYPOINT DISPLAYED COURSE LINE TO ACTIVE WAYPOINT FMS To -To Yes Previous and Active waypoint are connected.   The  FMS  flies  a DTK. FMS Direct-To No Desired Track line  is  drawn  to the active waypoint from the computer Direct-To position FMS To -From Yes Manually entered course line  is  drawn  to the Active waypoint. Manual Sequencing Yes A dashed line extends from the active waypoint. If the accuracy of the FMS navigation falls below the 95% threshold, a NAV Warn occurs.  All navigation information   remains   on   the   display   during   a   NAV Warn.    The  NAV  Warn  is  indicated  by  changing  the FMS Primary NAV source annunciator to amber. l.    KLN  90B  Map  Display  Options.    Refer  to Table 3C-9 for display options. Table 3C-9.  KLN 90B Map Display Options MAP MODE PREVIOUS WAYPOINT DISPLAYED COURSE LINE TO ACTIVE WAYPOINT Leg Mode Yes Previous and Active   waypoint are connected.   The  FMS  flies  a DTK. OBS Direct- To Mode No Desired Track line  is  drawn  to the active waypoint from the aircraft's current position. OBS Mode Yes Manually entered     course line is drawn from  the  Active waypoint. Manual Sequencing Yes A     dashed     line extends from the active waypoint. m. VOR   Map   Display   Operation.      Refer    to Table 3C-10 for the display option. If   the   primary   source   is   a   VOR,   a   solid   white bearing   line   is   drawn   from   the   aircraft   to   the   VOR station.  Since distance information is not available to the VOR station, the VOR station symbol is not drawn. Table 3C-10.  VOR/TCN Display Option MAP MODE PREVIOUS WAYPOINT DISPLAYED BEARING LINE TO ACTIVE WAYPOINT VOR No Bearing line extends from the aircraft symbol  towards  the station.        The    VOR symbol is not displayed.