TM 1-1510-225-10 3A-38 (13)   Course    Deviation    Bar.         The    course deviation bar represents the centerline of the selected navigation or localizer course. (14)   Compass    Card.        The    compass    card indicates    aircraft    heading    referenced    to    the    white triangular  heading  index  (lubber  line).    The  compass scale is divided in 5 increments with the 10 divisions being  approximately  twice  as  long.    Fixed  45  index marks are adjacent to the compass scale. (15)   Double  Bar  (#2  System)  Bearing  Pointer Source Annunciator.    The  double  bar  bearing  source annunciator  displays  the  navigation  sensor  providing bearing information to the double bar pointer. (16)   Double  Bar  (#2  System)  Bearing  Pointer Distance.   The double bar (#2 system) bearing pointer distance  display  shows  the  distance  to  the  selected bearing reference ground station. (17)   Double Bar (#2 System) Bearing Pointer.   The double bar  (#2 system) bearing pointer points to the    selected    bearing    sensor    ground    station,    or waypoint when in the LNAV mode. (18)   DME  Hold  Annunciator.    The  DME  hold annunciator  is  displayed  when  the  DME  hold  function is selected. (19)   Single Bar   (#1  System)  Bearing  Pointer Distance.   The single bar (#1 system) bearing pointer distance  display  shows  the  distance  to  the  selected bearing reference ground station. (20)   Single  Bar  (#1  System)  Bearing  Pointer Source  Annunciator.    The  single  bar  bearing  source annunciator  displays  the  navigation  sensor  providing bearing information to the single bar pointer. (21)   Single  Bar  (#1  System) Bearing Pointer.   The  single  bar  (#1  system)  bearing  pointer  points  to the    selected    bearing    sensor    ground    station    (or waypoint when in the LNAV mode). (22)   Selected  Heading  Digital  Display.    When the  EHSI  is  in  the  360  compass  mode,  a  full  time digital    readout    of    the    heading    selected    with    the heading  select  knob  is  shown  on  a  digital  display  on the  left  side  of  the  EHSI  below  the  vertical  deviation scale as well as by the heading marker. (23)   Vertical   Deviation   Scale   And   Indicator.   The vertical deviation scale appears on the left side of the  EHSI  when  ILS  or  VNAV  is  selected.    The  white vertical  deviation  scale  provides  a  reference  for  the vertical  deviation  indicator.    The  scale  and  indicator provide  ILS  glideslope  and  vertical  navigation  (VNAV) deviation  information.    The  deviation  indicator  moves in relation to the scale to indicate glide path center with respect to aircraft position. (24)   VNAV    Mode    Annunciator.        Indicates whether  VNAV  information  displayed  by  the  vertical deviation  pointer  and  scale  is  feet  (FT)  or  angle  in degrees (AN). (25)   Wind   Speed   and   Wind   Vector.      Wind speed   and   direction   information   is   displayed   in   the upper  left  corner  of  the  EHSI  if  using  LNAV  (GPS  or FMS) as the primary navigation source. 3A-22.  ELECTRONIC FLIGHT INSTRUMENT SYSTEM COMPOSITE DISPLAY MODES. If   an   EFIS   display   or   EADI   symbol   generator section fails, the composite mode may be selected for display on the remaining good display unit by pressing the composite, placarded  CMPST, switch indicator on the   instrument   panel.      The   base   composite   display uses  the  standard  EADI  display  for  its  foundation.  To it is added a standard lateral deviation scale, selected CRS, selected HDG, distance information, DME HOLD annunciation,   selected   NAV   sensor,   and   TO   /   FR information.      Creating   a   composite   display   in   this manner   provides   the   pilot   a   familiar   display,  which requires minimal transition time when it is selected for use.   The  composite  en  route  mode  display  is  shown in   Figure   3A-17  and  the  composite  approach  mode display is shown in Figure 3A-18. NOTE If the EADI section of the symbol generator fails,    a    full    composite    display    may    be displayed  on  the  EHSI.   If  the  EHSI  section fails, only pitch and roll information will be displayed on the EADI. The  following  paragraphs  describe  the  areas  of the   composite   display   that   differ   from   the   standard EADI display. NOTE As     the     aircraft     heading     changes,     the selected     course     arrow     will     follow     the heading    tape    and    may    disappear    from view. a.   Heading Tape.  If the heading data along the top of the horizon line becomes unavailable or invalid, a  stationary  red  HDG  annunciator  will  be  displayed above and to the right of the symbolic aircraft.