TM 1-1520-218-10 3C-158 Table 3C-73.  Markpoint List and Waypoint List Page Access and Usage Procedure NO. DESCRIPTION/FUNCTION 1 Mark waypoints regardless of which CDU page is displayed. 2 Pressing   EDIT   function   key   will   access the Edit page. 3 Mark  position  recorded  in  the  scratchpad and in the markpoint list. 4 Scroll to the Flight Plan Edit 2 page. 5 To view markpoints, access the Markpoint List page. 6 Mark  position  recorded  in  the  markpoint list. 7 Mark time is recorded automatically. 8 Possible entries at the A line select key: Press with a – in scratchpad to delete the point. Press  with  an  empty  scratchpad  to  copy the point to the scratchpad. Enter  I  with  identifier  name  to  name  the markpoint location and add it to the user waypoint list. 9 Scroll vertically to view other markpoints. (2)   Markpoint  List.    To  create  a  markpoint, press   the    MARK    function    key    when    the    desired position  is  overflown.    Pressing  the  MARK  key  will indicate  in  the  scratchpad  the  pilot’s  present  position solution    offset    by    any    active    cursor    position    as displayed   on   the   FDS   and   automatically   adds   the position   to   the   markpoint   list   on   the   Markpoint   List page.  It assigns the markpoint a unique letter identifier (A   through   J),   and   records   the   mark   time.      The Markpoint List page does not need to be displayed to use this function. Once   the   markpoint   is   on   the   Markpoint   List page,  it  is  treated  like  any  other  waypoint  and  can  be copied,  inserted  elsewhere,  or  deleted.    The  marked position   in   the   scratchpad   can   be   inserted   as   a waypoint  or  position.    It  can be cleared with the  CLR key. If 10 markpoints exist on the Markpoint List page and    another    mark    is    performed,    the    new    mark overwrites   the   first   (oldest)   mark   in   the   list.      A subsequent mark overwrites the second, and so on. Manual  position  entries  are  not  allowed  on  the Markpoint   List   page.      To   store   entered   waypoints manually, see the Waypoint List page. (3)   Waypoint List.  The user waypoint list is a list  of  up  to  200  user-defined waypoint identifiers that the  user  can  predefine  for  use  in  the  FMS.    Once  a user  waypoint  is  created,  it  can  be  recalled,  copied, and  used  like  any  identifier  from  the  primary  ICAO database   stored   on   the   data   cartridge.      The   user waypoint  list  is  maintained  in  non-volatile  memory  of the  CDU,  so  user-defined  waypoints  are  maintained through power cycles. To   create   a   user   waypoint,   access   the   User Waypoint  List  page  as  shown  in  Figure  3C–106 and Table   3C-74.      Select   the   NEW   line   select   key   to access   a   blank   waypoint   definition.      On   the   User Waypoint  page,  give  the  new  waypoint  a  name and a location.      The   location   can   be   a   latitude/longitude, another  waypoint  identifier,  or  bearing/distance  offset from  an  identifier.    Select  the  waypoint  type  from  the following   selections:   FIX,   VOR,   VORTAC,   TACAN, VOR/DME, NDB, NDB/DME, DME, or AIRPORT.  If a NAV  aid  type  is  selected,  enter  the  associated  NAV aid frequency and station declination.  If desired, enter the elevation of the user waypoint.  When all elements have been completed, RTN will switch to ADD and the new   user   waypoint   can   be   inserted   into   the   user waypoint list.  If a user waypoint already exists with the same     name,     a     prompt     will     appear     to     confirm overwriting the old waypoint definition.  To prevent an overwrite, press CLR or confirm to overwrite. To    use    the    new    user    waypoint,    recall    the waypoint  by  name  on  the  Flight  Plan  page,  or  any other  FMS  page  that  uses  ICAO  identifier  waypoints, or   copy   the   waypoint   from   the   User   Waypoint   List page.  The User Waypoint List page includes a search utility   to   help   find   a   desired   waypoint   or   to   scroll through the list to view waypoints in alphabetical order. To   modify   or   review   the   definition   of   a   user waypoint,  access  the  User  Waypoint  List  page  and select the right line select adjacent to the waypoint to be  modified.    Modify  the  user  waypoint  definition  on the User Waypoint page and reinsert the new waypoint when complete. To   delete   a   user   waypoint,   access   the   User Waypoint  List  page,  enter  a  – in the scratchpad, and press   the   left   line   select   key   adjacent   to   the   user waypoint  to  be  deleted.    When  200  user  waypoints have been defined in the list, the FMS will prevent any more  additional  waypoint  entries.    To  add  more  user waypoints,    current    user    waypoints    must    first    be deleted.