TM 1-1510-218-10 3C-116 The course/desired track readout and pointer on the EHSI show the great circle desired track at current aircraft  position  along  the  active  leg.    This  may  differ from  the  CRS  display  on  the  CDU  Flight  Plan  page when the distance to  the waypoint is large, especially at high latitudes.  The CRS display on the Flight Plan page  always  references  the  inbound  track  measured at the waypoint.  Refer to Figure 3C-62. When the inbound course to the active waypoint is   manually   entered   on   the   Flight   Plan   page,   the course display and course pointer on the HSI show the desired course at the waypoint. The scaling of the lateral deviation display on the HSI is determined by the selected FMS flight guidance mode  selected  on  the  Navigation  Configuration page, Paragraph 3C-25.e.(6)(d). 1.   En route.    4.0 nm full scale (2 dots) linear deviation. 2.   Oceanic.     4.0  nm  full  scale  (2  dots) linear deviation. 3.   Terminal.      1.0  nm  full-scale  linear deviation. 4.   Approach.      0.3  nm  full-scale linear deviation. The  scaling  of  the  vertical  deviation  display  on the HSI is also determined by the current flight mode. 5.   Oceanic, En route, or Terminal.   1000 feet full-scale deflection. 6.   Approach.               300     feet     full-scale deflection. If  no  flight  plan  active  waypoint  is  present  and the navigation solution is valid, the HSI display will be blank  removing  current  guidance  information.    If  the navigation  solution  is  invalid,  the  navigation  source indicator will be red.  If the navigation solution is valid but  performance  is  degraded,  the  navigation  source indicator will be yellow. (3)   Flight     Director     and     Autopilot     Lateral (Bank) Steering.  Using the Flight Director or autopilot, the  FMS  can  steer  the  aircraft  directly  through  all  of the  possible  flight  plan  maneuvers  including  holding patterns, MFP’s, SID’s, STAR’s, and FMS approaches.   This   interface   also   enables   the   FMS   to   limit   the commanded bank angle to the value specified on the Navigation Configuration page. The  FMS  provides  a  heading  submode  (FMS heading)   that   allows   the   crew   to   temporarily  fly  to selected   headings   while   still   using   FMS   waypoint navigation.  For those aircraft equipped with Electronic Flight Instrument Systems (EFIS), select FMS heading mode  by  pressing  the   HDG  knob  and  adjusting  the knob  to  the  desired  heading.    The   FMS  will  provide commanded bank to the selected heading indefinitely or until the heading is adjusted in such a way as to re- intercept the previous course. (a)   Additional Displays on Electronic Flight  Instrument  Systems.    For  those  aircraft  which are equipped   with  an  electronic  flight  display  system (EFIS or FDS), additional displays may be provided as shown in Figure 3C-62. 1.   Eight     future     flight     plan     waypoints (including the active) to give advance notice  of  impending  leg  changes  and relative  distances  to  future waypoints when   the   EHSI   is   in   MAP   mode, Figure 3C-63. 2.   Identification  of  the  type  of  waypoint (i.e.,    NAV    aid,    intercept,    standard waypoint,     airport,     etc.)     and     label identifier. 3.   Groundspeed. 4.   True Airspeed. 5.   Wind direction and speed. 6.   Time to go. 7.   Bearing to Waypoint. 8.   Elapsed Time. (4)   FMS    Heading    Mode    Overview.        The FMS-800 provides heading guidance for radar vectoring   to   intercept   a   final   approach   course   of   a published  GPS  approach,  without  the  pilot  needing  to deselect  and  reselect  the  flight  control  system  NAV mode.