TM 1-1510-225-10 3D-59 CRSR INIT POSN WPT: KMCK N 37^o 39.00‘ W 97^o 25.97’   0 KT 308^o CONFIRM? Figure 3D-80.  Setup 1 Page (1)   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   nonvolatile   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    Since  the  KLN  90B  routinely updates the almanac data during normal operation, the almanac  data  will  become  out  of  date  only  if  the  KLN 90B  hasn't  been  used  for  the  previous  6  months  or longer.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. (2)   The  aircraft  must  be  located  so  the  GPS antenna has an unobstructed view of the sky. (3)   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. 1.     Select  the  Setup  1  page  by  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. NOTE As an alternative, the latitude and longitude  of  the  present  position  can  be entered    directly    instead    of    entering    a waypoint identifier. 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. 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   908   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 reinstalled. 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. c.   The Setup 2 Page. Refer to Figure 3D-81 for a sample page.  The KLN 90B's system time and date should   seldom   require   updating   because   they   are automatically  updated  when  at  least  one  satellite  is received.      In   addition,   the   KLN   90B   contains   an internal    battery    powered    calendar    clock    to    keep system time and date when the unit is not being used.   The  correct  time  and  date  are  normally  confirmed  on the Self-Test page, but the Setup 2 page can also be used. NOTE The time and date cannot be changed if the KLN 90B is receiving time and date from a satellite.