TM 1-1510-218-10 3-63 Figure 3-82.  SET 2 Page – Set Time 2.   Press the left  CRSR button to turn on   the   left   cursor   function.      The cursor will be over the entire date. 3.   Use the left outer knob to position the cursor over the time zone. 4.   Use  the  left  inner  knob  to  select the desired time zone. 5.   Turn  the  left  outer  knob  one  step counterclockwise    to    position    the cursor over the time. 6.   Rotate the left inner knob to select the correct hour (24-hour time). 7.   Turn  the  left  outer  knob  one  step clockwise  to  position  the  flashing part   of   the   cursor   over   the   tens position   of   the   minute,   and   then use the left inner knob to select the correct value. 8.   Turn  the  left  outer  knob  one  step clockwise   to   position   the   cursor over the remaining minutes position, and then use the left inner knob to complete the time selection. 9.   Press the   ENT  button  to  start  the clock running. 10.   Press the left  CRSR button to turn off the left cursor function. The  KLN  90B's  primary  coverage  area  is  from N74^o  to  S60^o  latitude.    All  navigation  data  presented outside  this  area  is  automatically  reference  to  true North  unless  a  manual  input  of  magnetic  variation  is made on the SET 2 page.  The same is true any time the   KLN   90B   is   in   the   OBS   mode   and   the   active waypoint is outside the primary coverage area.  Under both  of  these  conditions,  the  message,  MAGNETIC VAR INVALID  – ALL DATA REFERENCED TO TRUE NORTH, is displayed on the message page. When  navigation  is  within  the  primary  coverage area,   the   SET   2   page   does   not   display   magnetic variation.      However,   under   the   above   conditions,   a user-entered magnetic variation may be made on line 6  of  the  SET  2  page  using  the  left  CRSR button and the left inner and outer knobs. (4)   The  Setup  3  Page.    The  nine  airports  in the  nearest  list  are  the  nine  airports  that  meet  the criteria  selected  on  the  SET  3  page.    Refer  to  Figure 3-83. SET 3 NEAREST APT CRITERIA MIN LENGTH:       3000’ SURFACE:     HRD SFT Figure 3-83.  SET 3 Page 1.   Select the SET 3 page on the left side. 2.   Press the left  CRSR button to turn on the  left  cursor  function.    The  cursor will  appear  over  the  minimum  runway length. 3.   Use  the  left  inner  knob  to  select  the minimum   length   runway   desired   for the  airport  to  qualify  for  the  nearest airport list.  Values between 1000 feet and  5000  feet  in  100-foot increments may be used. 4.   Rotate  the  left  outer  knob  one  step clockwise  to  position  the  cursor  over the runway surface criteria. 5.   Turn the left inner knob to select either HRD  SFT  or  HRD.    If  HRD  SFT  is chosen,   both   hard   and   soft   surface runways  meeting  the  required  runway length  will  be  included  in  the  nearest