TM 1-1510-218-10 3-74 SUP E N T USE? INVRT?   1:KDAL   2:BUJ   3:TXKA   4:KLIT   5: CRSR E N R   -   L E G TXKA REF:  TXK RAD: 330.3^o DIS: 32.8NM N 34^o 01.08’ W 94^o 19.67’ Figure 3-106.  Reference Waypoint Name 7.   Press    the    ENT    button    once    again    to approve the waypoint page for the reference  waypoint  and  insert  it  into  the flight plan. 8.   Press the right CRSR button to turn off the right cursor function. A reference waypoint is stored as a supplemental waypoint and counts as one of the 250 possible user-defined waypoints. Reference waypoints that are part of a flight plan show up on the listing   of   user–defined   waypoints   displayed   on   the OTH  3  page.    However,  reference  waypoints  that  are not part of a flight plan are deleted from the list of user- defined waypoints when the KLN 90B is turned off. bg.  Center Waypoints.  Like reference waypoints,  creating  Center  waypoints  is  a  method  of adding  waypoints  to  a  flight  plan.    Center  waypoints are    waypoints    at    locations    where    a    flight    plan intersects    the    Center    or    FIR    boundary.        Placing waypoints   on   the   boundary   results   in   the   minimum number of waypoints required for criteria of having one waypoint   in   each   Center's   airspace.      The   Center boundaries are stored in the database. (1)   Creating Center Waypoints. 1.   Select the Center Waypoint 1 (CTR 1) page on the right side.  If a flight plan page is not being displayed on the left side,   the   CTR   1   page   will   display: DISPLAY DESIRED  - FPL ON - LEFT PAGE. 2.   Select  the  desired  flight  plan  page  on the left side.  It may be the active flight plan or one of the other 25 numbered flight plans. 3.   Press the  ENT button to compute the Center   waypoints,   Figure   3-107.    A Center   waypoint   will   be   created  at each intersection of the flight plan with a center boundary. When computation  is  complete,  the  CTR  1 page   will   display   how   many   Center waypoints have been computed.   Refer to Figure 3-108. USE? INVRT?   1:KLBB   2:KMCK   3: FPL 3 CTR 1 E N T E N R   -   L E G PRESS ENT TO COMPUTE CTR WPTS Figure 3-107.  CTR 1 Page  - Computing Waypoints CTR 1 3 NEW WPTS PRESS ENT TO INSERT INTO FPL E N T Figure 3-108.  CTR 1  Page - Center Waypoints 4.   To  view  the  Center  waypoints  before inserting them into the flight plan, turn the RIGHT INNER knob to the CTR 2 page.  Multiple Center 2 pages will be annunciated as CTR+2. The top line contains the identifier of the Center waypoint.      The   KLN   90B   automatically  creates  the identifier   by   appending   the   first   available   two–digit number  to  the  identifier  of  the  nearest  VOR  to  the waypoint.  Therefore, if Plainview (PVW) is the nearest VOR  to  the  first  Center  waypoint  location,  the  00  is appended  to  PVW  to  create  PVW00.    If  PVW  were later used in the creation of another Center waypoint, the second waypoint's identifier would be PVW01. The  second  line  of  the  CTR  2  page  shows  from Center  followed  by  the  to  Center.    In  this  example, PVW00 lies on the boundary between Ft. Worth (FW) and Albuquerque (ABQ) Centers. The  third  and  fourth  lines  of  the  CTR  2  page display  the  Center  waypoint  location  in  terms  of  the identifier  of  the  nearest  VOR  to  the  Center  waypoint and   the   distance   and   radial   from   this   VOR   to   the Cent er waypoint.  Lines five and six display the Center