TM 1-1510-218-10 3C-138 When the discontinuity becomes active, guidance displays will be invalidated and the FMS will continue a wings–level flight until the pilot takes action to resolve the discontinuity. Figure 3C-83.  Discontinuity in the Flight Plan Table 3C-62.  Discontinuity in the Flight Plan Procedure NO. DESCRIPTION/FUNCTION 1 Pressing    FPLN   function   key   for   Flight Plan page. 2 The waypoint associated with the discontinuity. 3 The active waypoint. m. FMS Approaches. (1)   FMS   Approach   Overview.        The    FMS approach  function  employs  GPS  navigation  to  fly  the following types of approaches. 1.   FAA published RNAV approaches. 2.   FAA published RNAV, VOR, VOR/DME, VORTAC, and NDB approaches with GPS overlay approved procedures (GPS or INU/GPS only). 3.   FAA published GPS approaches (GPS or INU/GPS only). 4.   Military approved approach procedures  for  air  bases  in  lieu  of  ILS or other approach guidance. 5.   Visual  runway  approaches  at  night  or in reduced visibility. 6.   Military tactical approaches to forward air   bases   where   the   approach   key points have been surveyed or marked using precise GPS. (2)   Selection   of   an   FMS   Approach.    FMS approaches  may  be  flown  using  the  active  flight  plan guidance.  They may not be inserted into an alternate flight plan. (3)   To select an FMS approach for use in the active  flight  plan,  press  the   EDIT  function  key  on  the CDU  and  then  select   FMS  APPR  line  key  to  access the FMS APPR selection page.  Refer to Figure 3C-84 and Table 3C-63.  The three types of FMS approaches that may be selected are GPS, Visual, or Tactical.  To select    either    a    published    GPS    or    runway    visual approach,     enter     the     Destination     (DEST)     airport identifier  at  the  top  of  the  page  (also  entered  on  the working copy STAR definition).  This calls up a listing of   available   GPS   approaches   and   runways   for   that airport.  To select a user defined tactical approach, no airport identifier is required, select the  TACTICAL line key. Two  different  FMS  approaches  can  be  selected and maintained by the FMS–800.  One is inserted into the active flight plan and the other is referred to as the working  copy.    The  current  approach  definition  being displayed  is  indicated  by  the  data  on  the  information line of the FMS Approach page and by asterisks and larger    arrows    displayed    adjacent    to    the    selected approach.    Large  arrows  indicate  that   the  item  has been selected for insertion (working copy).  Asterisks indicate that the item is currently included in the active flight plan.