NOTE It  is  characteristic  of  the  computer  display routine   to   add   “0.2“   arc-seconds   to   any display  of  “59.9”  arc-seconds.  The  value in  computer  is  as  loaded  by  operator. (6.)  To  insert  TACAN  coordinates: (a.)   Insertion   of   UTM   TACAN   sta- tion data: NOTE Prior  to  pressing  the  INSERT/ADVANCE pushbutton,   any   incorrectly   loaded   data can   be   corrected   by   pressing   CLEAR pushbutton   and   loading   correct   data. 1. Data  selector  -  UTM  WY PT. 2.   Keys   “7“   and   “9”   -   Press simultaneously.   Observe   that number   of   TACAN   station being   used   for   navigation flashes on and off in “FROM-TO“   display   and data  displays  indicate  coor- dinates  of  station  selected  by thumbwheel. 3.  Thumbwheel  -  Set  to  num- ber  of  station  to  be  loaded. Confirm  thumbwheel  is  in detent. 4. Station “0” c a n n o t    be loaded.  Observe  that  if  num- ber  of  station  to  be  loaded  is s a m e   a s   n u m b e r   o f   t he TACAN   station   currently b e i n g    u s e d ,    n u m b e r    in “FROM-TO“  display  will  be set to “0“ when TACAN data is  loaded. 5.   To   load   zone   and   easting   - Press  keys  in  sequence,  start- ing  with  “E“.  Example:  Zone 16, 425 km East = E16 425. Observe  that  zone  and  east- ing  in  kilometers  appear  in the  right  display  as  keys  are pressed. 6.  INSERT/ADVANCE  push- button  -  Press.  Observe  that pushbutton  light  is  illumi- nated. TM  55-1510-221-10 7.  To  load  northing  -  Press keys   in   sequence,   starting with  “N“  or  “S”  to  indicate north   or   south   hemisphere. Example:  4749  km  North  = N  4749.  Observe  that  north- ing  kilometers  appear  in  left data  display  as  keys  are pressed. 8.  INSERT/ADVANCE  push- button -  Press.  Observe pushbutton   light   remains illuminated. 9.  INSERT/ADVANCE  push- button  -  Press.  Observe  that extra precision display related  to  the  resident  value of  northing  and  easting,  to nearest  meter,  appears  in  left and   right   data   displays, respectively. NOTE UTM   data   may   be   loaded   in   any   order. Until  final  fourth  entry,  actuation  of INSERT/ADVANCE    pushbutton    without a  prior  data  entry  will  cause  normal  and extra   precision   UTM   data   to   be   alter- nately   displayed. 10. 11. 12. To  load  extra  precision  east- ing  value  -    Press  keys  in sequence,   starting   with   “E”. Example:  297  m  East  =  E 297.   Observe   that   easting meters   appear   in   right   data display  as  keys  are  pressed. INSERT/ADVANCE    push- button   -   Press.   Observe pushbutton   remains   illumi- nated. To  load  extra  precision northing   value   -   Press   keys in   sequence, starting   with “N” or “S”. Example: 901 m North =  N  901.  Observe that   northing   meters   appear in   left   data   display   as   keys are   pressed.   The   value   is always  added  to  -ormal value   regardless   of   which key  (N/S)  is  pressed  to  ini- tiate  entry.  The  normal  entry establishes   hemisphere. 3-57