TM 1-1510-225-10 3D-4 use.    Includes  all  public  GPS  only approaches. 6.     Miscellaneous. a.   Air   Route   Traffic   Control   Center (ARTCC's   and   FIR's)   boundaries and frequencies (VHF and HF). b.   Flight  Service  Stations  (location  of points of communication and associated frequencies  – VHF and HF). c.   Minimum safe altitudes. d.   Special  Use  Airspace  boundaries (Prohibited,    Restricted,    Warning, Alert, MOA, Class B, TRSA, Class C, CTA, TMA). 7.     250 User-Defined Waypoints. a.   Identifier. b.   Latitude and Longitude. c.   Additional  data  depending  on  how user defines waypoint: 1    User     airports    (elevation    and surface of longest runway). 2    User VOR (frequency and magnetic variation). 3    User NDB (frequency). (2)   Waypoints   are   stored   in   the   KLN   90B database almost exclusively by their ICAO identifiers. NOTE There are several exceptions in Alaska.   In many    cases,    airports    with    three    letter identifiers  receive  the  prefix  P,  but  there are   many   that   don’t.      The   most   reliable method   of   determining   an   Alaska   airport identifier  is  to  look  it  up  from  the  airport name or city. (3)   Not  all  airports  receive  the  prefix letter.   Airport identifiers that are combinations of letters and numbers do not receive the prefix letter. b.  Database  Update.    There  are  two  ways  to update the database. (1)   Cartridge   Exchange.      The   new   update may  be  installed  any  time  prior  to  the  effective  date and the KLN 90B will use the previous data up to the effective  date  and  automatically  begin  using  the  new data on the effective date.   1.     Insert the KLN 90B insertion/ removal tool  in  the  small  hole  located  on  the right side of the unit.  A standard  3/32 inch Allen wrench may also be used. 2.     Turn  tool  counterclockwise  until  the locking    mechanism    becomes    loose and then continue turning counterclockwise   until   it   just   barely begins  to  become  snug.    Do  not  turn so     far     counter-clockwise     that     the mechanism starts  to  bind  and  can  no longer be turned. 3.     Pull the unit out of the rack by pulling on  the  sides  of  the  panel.    DO  NOT PULL ON THE KNOBS. 4.     Remove the old cartridge by pulling it straight out of the back. 5.     Insert  new  cartridge  into  the  back  of the KLN 90B as indicated by the label on  the  cartridge.    When  the  cartridge is   properly   inserted,   the   "Insert   To Here" marking on the label can just be seen  protruding  from  the  rear  of  the unit. 6.     Make sure the front lug of the locking mechanism  is  in  the  up  position  and insert unit into the rack as far as it can go. 7.     Re-insert tool and turn clockwise until snug.    Pull  gently  on  front  panel  to verify unit is locked into the rack. (2)   Laptop Computer Using 3.5” Diskettes. 1.     Plug  9-pin  female  connector  end  of interface  cable  into  a  COM  serial  port of computer. 2.     Plug  the  other  end  of  the  interface cable into the data loader jack on the annunciator panel. 3.     Turn  on  computer,  insert  Disk  1  and the   program   will   automatically   load and the screen will indicate ready.