TM  55-1510-221-10 13. INSERT/ADVANCE    push- button  -  Press.  -  10erve  that during  the  next  1  to  3  sec- onds,   the   computer   converts input  into  latitude  and  longi- tude  for  storage  in  memory. The   stored   value   is   again converted   back   to   UTM   for display  to  operator.  The INSERT/ADVANCE  push- button  light  extinguishes. The  conversion routines may  cause  data  displays  to change  by  up  to  10  m. NOTE The  computer  will  convert  coordinates  in overlap  area;  however,  data  display  values will  reference  appropriate  zone. NOTE The  “W”  key  may  be  used  to  initiate  east- ing  entries;  however,  the  computer  will always  interpret  such  entries  as  an  “E” input.  “E“  will  be  displayed  in  normal UTM  data  display. NOTE The  extra  precision  values  are  always added  to  normal  values.  As  an  example, South  4,476.995  m  will  display  “4476  S“ in  normal  display  and  “995”  in  extra  pre- cision  display.  In  other  words,  there  is  no rounding  between  the  two  displays. 14. 15. 16. INSERT/ADVANCE    push- button  -  Press.  Observe  right data   display   indicates   last previously  inserted  altitude, and  left  data  display  is blank. To  indicate  the  following load  is  altitude  -  Press  keys “4” or “6“. Observe INSERT/ADVANCE  push- button   light   illuminates. To   load   altitude   in   feet   - Press   keys   in   sequence. Example:   1230   ft   =   1230. Observe that numbers appear   in   right   data   display as  keys  are  pressed. NOTE Altitude  inputs  are  limited  to  15,000  feet. 17. 18. 19. 20. 21. INSERT/ADVANCE    push- button -  Press.  Observe pushbutton light extin- guishes. INSERT/ADVANCE    push- button  -  Press.  Observe  that left   data   display   indicates last previously inserted channel  number,  and  right display  is  blank. To  indicate  following  load  is channel  number  -  Press  keys "2" "8" Observe INSERT/ADVANCE    push- button   light   illuminates. To  load  channel  number  - Press   keys   in   sequence. Example: 109 = 109. Observe   number   appears   in left  data  display  as  keys  are pressed. INSERT/ADVANCE    push- button -  Press.  Observe pushbutton light extin- guishes. NOTE Any   number   will   be   accepted   by   INS; however,  only  stations  with  a  channel number  within  range  of  “1”  through “126“  will  be  used  for  TACAN  mixing. NOTE Channel  number  has  an  implied  “X“  suf- fix. NOTE Degree   symbol   (°)should   be   disregarded when  reading  altitude  and  data  display. 22.   INSERT/ADVANCE   push- button  -  Press.  Observe  sta- tion  northing,  zone,  and easting   reappear. 23. Repeat steps -1- through -22- for  each  TACAN  station. 24.  To  return  INS  to  normal mode,   momentarily   set   data selector  to  UTM  POS. 3-58