TM 1-1510-225-10 3D-61 VAR INVALID  – ALL DATA REFERENCED TO TRUE NORTH. (b)   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. d.  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 3D-83. SET 3 NEAREST APT CRITERIA MIN LENGTH:       3000’ SURFACE:     HRD SFT Figure 3D-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 airport list.  If HRD is chosen,  only  hard  surface  runways  will be     included.          Hard     surface     runways include concrete, asphalt, pavement, tarmac,  brick,  bitumen,  and  sealed.    Soft surface runways include turf, gravel, clay, sand,  dirt,  ice,  steel  matting,  shale,  and snow. e.   The Setup 4 Page.  The SET 4 page is used to define the departure time.  Refer to Figure 3D-84. 1.   Select the SET 4 page. 2.   Turn on the left cursor function. 3.   Use the left inner knob to select between RUN  WHEN  GS  >  30KT  or  RUN  WHEN POWER IS ON. 4.   Turn off the left cursor function. SET 4   FLIGHT   TIMER OPERATION RUN WHEN GS > 30KT Figure 3D-84.  SET 4 Page f.    The Setup 5 Page. The height above airport feature provides an altitude alert annunciator when the aircraft   has   reached   a   selected   altitude   above   the airport.  This feature is enabled/disabled on the SET 5 page.    Refer  to  Figure  3D-85.    The  altitude  is  also selected on the SET 5 page. SET 5 HT ABOVE APT ALERT     ON APT ELEV   +1500FT Figure 3D-85.  SET 5 Page