TM 1-1510-225-10 3A-102 3.   BACK key  –  Press.    Cursor  field will   display   MAN?   to   inform   the pilot of the pending change. 4.   ENTER key  –  Press.    The  cursor will disappear and MAN will remain  in  the  field  confirming  that leg changes must be made manually.    NO  AUTO  LEG  CHG message will appear on the System Messages page, however the MSG light will not illuminate. (c)   Returning To Automatic Leg Change  Mode. 1.   NAV key – Press to display NAV 1 page. 2.   Line select key – Press to position cursor over MAN. 3.   BACK  key   –  Press.    The  cursor disappears  and  AUTO  remains  in the  field  confirming  return  to  the automatic  leg  change  mode.    NO AUTO LEG CHG message on the system messages page disappears  unless  the  current  TO waypoint  is  the  last  waypoint  on the active flight plan. (7)   External Waypoint Acceptance.  Up to 99 external waypoints may be accepted from an interfaced    radar    or    EFIS.        When    a    waypoint    is generated   from   this   equipment,   a   DIRECT   TO   leg change   is   made   to   that   waypoint.      The   generated waypoint will be designated EX#01 to EX#99. As  the  external  waypoint  (EX#)  is  off  the  flight plan,  it  will  be  separated  from  the  active  flight  plan waypoint    sequence    and    a    NO    AUTO    LEG    CHG message will appear on the System Messages page.   The  following  procedure  may  be  used  to  link  the  EX# waypoint into the flight plan sequence. 1.     D      key   –  Press.    The  display  will show  direct  to  the  EX#  waypoint  with the  complete  active  flight  plan  listed below. 2.   Line select key – Press to position the cursor over the waypoint to follow the EX# waypoint. 3.   EX# waypoint identifier  – Insert. 4.   ENTER key – Press. NOTE The EX# waypoint identifier will flash if an unassigned     number     is     entered.          EX# waypoint coordinates can only be assigned by an external source (radar or EFIS). 5.   Waypoint page coordinates – Verify. 6.   ENTER key – Press. 7.   Waypoint sequence – Verify. 8.   ENTER key – Press.  CDU display will automatically   advance   to    Navigation page     and     NO     AUTO     LEG     CHG message   will   be   removed   from   the System Messages page. (8)   Present   Position   As   A   Waypoint.      A special    waypoint    location    is    reserved    for    storing present   position   coordinates   as   a   waypoint.      The identifier   for   this   waypoint   is   inserted   as   #1.      The identifier  may  be  used  as  a  parent  identifier  for  an offset waypoint by adding an *. NOTE Since  waypoint  #1  is  frequently  redefined, it is not retained in nonvolatile memory and the   identifier   #1   cannot   be   entered   on   a stored flight plan.  It does, however, use up one  of  the  999  available  waypoints,  as  do #OFF and EX waypoints.  Waypoint  #1  is  redefined  each  time  the   HOLD key   is   pressed.      An   example   of   the   application   of waypoint   #1   is   to   store   the   coordinates   of   a   point overflown  to  which  you  may  wish  to  return.    This  is accomplished by pressing the  HOLD key directly over that   desired   point.      In   this   case   these   coordinates would   be   stored   under   identifier   #1  until  either  the HOLD   key   is   pressed   again,   updating   #1,   or   the system is shut down. (9)   Navigation  At  Extreme  Latitudes  (North Of 70 ºN Or South Of 60 °S). The     procedures     listed     in     this     section contain   instructions   for   operation   of   the flight    management    system    at    specified latitudes beyond the autocomputed magnetic variation mode.  In all cases, the flight   crew   of   any   aircraft   operating   at these    latitudes    must    consult    the    flight manual    supplement    in    order    to    obtain satisfactory performance and accuracy. WARNING