TM 1-1510-225-10 3D-33 flight  plan  in  inverse  order,  first  waypoint becomes     the     last     and     last     waypoint becomes   the   first,   rotate   the   left   outer knob  one  step  clockwise  to  position  the cursor over USE? INVRT? before  pressing the ENT button. 5.   The  selected  flight  plan  is  now  displayed as   FPL   0,   the   active   flight   plan.      Any changes made to FPL 0 will not affect how this  flight  plan  is  stored  as  the  numbered flight plan. c.   Adding   a   Waypoint   to   a   Flight   Plan.    A waypoint  may  be  added  to  any  flight  plan  containing fewer than 30 waypoints. 1.   Press the left  CRSR  button  to  enable  the cursor function. 2.   Rotate the left outer knob as necessary to position the cursor over the location in the flight plan where the new waypoint is to be added. 3.   Use  the  left  inner  and  outer  knobs  in  the normal    manner    to    enter    the    waypoint identifier    being    inserted.        The    existing waypoint    in    this    position    automatically jumps down to the next position. 4.   Press    the    ENT    button    to    display    the waypoint   page   on   the  right  side  for  the identifier just entered. 5.   Press the   ENT  button  again  to  approve the waypoint page. 6.   Press the left  CRSR button to turn off the left cursor function. d.  Deleting a Waypoint From a Flight Plan. 1.   Press the left  CRSR  button  to  enable  the left cursor function. 2.   Rotate  the  left  outer  knob  to  position  the cursor over the waypoint to be deleted. 3.   Press  the  CLR  button.    The  letters  DEL   will appear to the left of the identifier and a question  mark  will  appear  to  the  right  of the   identifier.      If   a   mistake  was  made, press   the   CLR  button  again.    Refer  to Figure 3D-39. 4.   Press the   ENT  button  and  the  waypoint will  be  deleted  from  the  flight  plan.    The other  waypoints  in  the  flight  plan  will  be repositioned.   1:KMKC   2:BUM DEL OSW?   4:TUL   6:KRVS CRSR Figure 3D-39.  Deleting a Waypoint e.   Deleting Flight Plans.  1.   Display the flight plan that is to be deleted. 2.   Make sure the left cursor function is off. 3.   Press    the     CLR    button.        The    words DELETE FPL? will appear at the top of the page.  Refer to Figure 3D-40.  If a mistake was made, press the CLR button. 4.   Press the   ENT  button  to  clear  the  flight plan. DELETE FPL?   1:KMKC   2:BUM   3:OSW   4:TUL   6:KRVS CRSR Figure 3D-40.  Deleting a Flight Plan f.    Storing FPL 0 As a Numbered Flight Plan.   The active flight plan may be loaded into a numbered flight plan so that it can be recalled for later use. 1.   Select  a  numbered  flight  plan  page  that does  not  contain  any   waypoints.    If  none exist,  use  the  procedure  for  deleting  flight plans to clear a flight plan that is no longer required.