TM 1-1510-225-10 3D-10 opportunity.      To   view   the   message,   press   the   MSG button.  The message page, which takes up the whole width  of  the  display,  will  appear  and  show  the  new message.    It  is  possible  that  several  messages  are displayed  at  one  time  on  the  message  page.    The newest message displays first and the rest in reverse chronological order. After    reading    the    message,    press    the    MSG button     again     to     return    to    the    pages    that    were previously   in   view.      If   all   the   messages   cannot   be displayed on one page, repeated presses of the  MSG button  will  show  the  other  messages  before  returning to the pages that were previously in view.  Whenever a message   condition   exists   which   requires   a   specific action,   the   message   prompt   will   remain   on   but   not flashing. 3D-7.  INITIALIZATION. Since the KLN 90B stores its position and other required parameters in memory when power to the unit is  removed,  it  is  seldom  necessary  to  aid  the    unit in reaching  a  NAV  ready  status.    In  order  for  the  unit  to reach  a  NAV  ready  condition,  it  is  necessary  to  meet the following conditions. a.   The    KLN    90B’s    almanac    data    must    be current.    Almanac  data  is  crude  orbital  information  for all the satellites and is used for initial acquisition when the  unit  is  first  turned  on.    This  data  is  stored  in  the KLN   90B’s   non-volatile   memory   and   is   considered current up to 6 months.  Each satellite sends almanac data  for  all  satellites.    Since  the  KLN  90B  routinely updates the almanac data during normal operation, the almanac  data  will  become  out  of  date  only  if  the  KLN 90B  hasn’t  been  used  for  the  previous  6  months  or longer.      Collecting   new   almanac   data   takes   place automatically  if  the  data  is  more  than  6  months  old.   This  will  usually  take  about  6  minutes,  but  no  more than 12 minutes. b.  The   aircraft   must   be   located   so   the   GPS antenna has an unobstructed view of the sky. c.   It is very helpful for the KLN 90B to have the correct  date,  time,  and  position.    This  information  is stored in the battery-backed  memory  of  the  KLN  90B so it is not normally required to update it.  If acquisition time is not important,  it is not necessary to update the date,   time,   and   position.      See   paragraph   3D-2.c  for setting the date and time, if necessary.   1. Select    the    Setup    1    page    by    first turning  the  left  outer  knob  to   SETUP  displaying a SET page annunciated in the  lower  left  segment  of  the  display.   Next, turn the left inner knob until the SET 1 page is selected. 2. Press  the  left   CRSR  button  to  bring the cursor on the page over the WPT field. 3. Use    the    left    inner    knob    to    enter characters  and  the  left  outer  knob  to move the cursor until the identifier for the location is entered. 4. Press   the    ENT   button   to   view   the waypoint page on the right side. 5. Press the ENT     button     again     to approve the entry. NOTE As an alternative, the latitude and longitude  of  the  present  position  can  be entered    directly    instead    of    entering    a waypoint identifier. 6. Use the left outer knob to position the cursor over CONFIRM?. 7. Press the ENT button.  NOTE The   groundspeed   and   heading   fields   are not used for initialization in the aircraft.  If the   KLN   90B   is   in   the   take-home   mode, entering a groundspeed will allow the KLN 90B  to  fly  along  the  active  flight  plan  (or direct   to   a   waypoint)   starting   from    the initialization  waypoint.    A  heading  may  be entered in the initial heading field while in the  take-home  mode  if  the  one  offered  is not   desired.      If   the   take-home   mode   is used,  the  KLN  90B  must  be  initialized  to the     aircraft’s     location     when     it     is     re- installed. 8. Use the left knobs to select the NAV 2  page.    When  the  KLN  90B  reaches the  NAV  ready  status  and  is  able  to navigate,  the  NAV  2  page  will  display the present position. Verify the latitude    and    longitude    or    the    VOR radial and distance displays are correct. 3D-8.  SELECTING WAYPOINTS. There    are    five    types    of    waypoints:    airports, VOR's, NDB's, intersections, and supplemental.   Waypoints  in  the  published  database  fall  into  one  of