TM 1-1510-225-10 3A-48 (2)   Airport Reference Points.  All airports with hard surfaced runways longer than 2,000 feet. (3)   Waypoints, Intersections, and Approaches. 1.   High altitude waypoints. 2.   Low altitude waypoints. 3.   Standard  Instrument  Departure  (SID) waypoints. 4.   Standard Terminal Arrival Route (STAR) waypoints. 5.   Approach intersections. 6.   Non-precision approaches. (4)   Database Revisions.  System owners are shipped database revision every 28 days in the form of an  electronic  memory  card  for  the  first  year  from  the date   of   warranty   registration,   and   by   subscription thereafter. c.   Controls, Indicators, and Functions (GNS- XLS Control-Display Unit).  Refer to Figure 3A -23. (1)   Navigation  Key.   Pressing the navigation key, placarded   NAV,  will  cause  the  first  page  of  the navigation    section    to    be    displayed    on    the    flight management  system  control-display  unit.    The  next sequential   page   in   the   navigation   section   will   be displayed     with     each     subsequent     press     of     the navigation key. (2)   Vertical   Navigation   Key.      Pressing   the vertical  navigation  key,  placarded   VNAV,  will  cause the  first  page  of  the  vertical  navigation  section  to  be displayed  on  the  flight  management  system  control- display  unit.    The  next  sequential  page  in  the  vertical navigation     section     will     be     displayed     with     each subsequent press of the vertical navigation plan key. (3)   Airborne Flight Information Key. NOTE Airborne  Flight  Information  System  (AFIS) is not installed in Army aircraft. Pressing the key placarded AFIS will cause a message, NOT INSTALLED to be displayed on the flight management system control display unit. (4)   Flight Plan Key.   Pressing the flight plan key,  placarded  FPL,  will  cause  the  first  page  of  the flight    plan    section    to    be    displayed    on    the    flight management  system  control-display  unit.    The  next sequential   page   in   the   flight   plan   section   will   be displayed with each subsequent press of the flight plan key. (5)   Power   Key.      Pressing   the   power   key, placarded ON, will apply power to the system.  After a warmup period of approximately 5 minutes, the display will  initially  appear  at  maximum  brightness.  Pressing the power key for approximately 3 seconds will initiate the system power off sequence.  During the sequence, the display will annunciate, SYSTEM TURNING OFF.   This   time   delay   and   annunciation   are   designed   to prevent inadvertent system shutdown. NOTE The flight management system may be left on and turned on and off by the AVIONICS MASTER PWR switch. (6)   Brightness Key.   Pressing the brightness key, placarded  BRT, will change the illumination of the flight  management  system  control-display  unit.    The flight management system display will initially come on at  full  brightness  when  power  is  applied.    Hold  the brightness   key   pressed   to   dim   the   display   to   the desired level.  The brightness key is also used to align the line selection keys. (7)   Blank  Key.    This  key  is  not  used  in  this installation. (8)   Planning Key.  Pressing the planning key, placarded   PLAN,   will   cause   the   first   page   of   the planning  procedures  section  to  be  displayed  on  the flight  management  system  control-display  unit.    The next   sequential   page   in   the    planning    procedures section will be displayed with each subsequent press of the planning key. (9)   Heading  Key.  Pressing the heading key, placarded  HDG,  will  cause  the  heading  section  page to   be   displayed   on   the   flight   management   system control-display unit. (10)   Tuning   Key.      Pressing  the  tuning  key, placarded   TUNE,   will   cause   the   first   page   of   the remote   tuning   section   to   be   displayed   on   the   flight management  system  control-display  unit.    The  next sequential  page  in  the  remote  tuning  section  will  be displayed   with  each  subsequent  press  of  the  tuning key.