TM 55-1510-220-10 NOTE Channel  number  has  an  implied  "X" suffix. NOTE Degree symbol (°) should be disregarded    when    reading    altitude and data display. t. INSERT/ADVANCE pushbutton Press.      Observe   station   northing, zone, and easting reappear. u.   Repeat  steps  3  through  20  for  each TACAN station. v.   To   return   INS   to   normal   mode, momentarily    set    data    selector    to UTM POS. (b) Insertion of geographic TACAN station data: NOTE Prior to pressing INSERT/ADVANCE pushbutton,    any    incorrectly    loaded data   can   be   corrected   by   pressing CLEAR pushbutton and loading correct data. 1. Data selector L/L WY PT. NOTE If  number  of  station  to  be  loaded  is same   as   number   of   TACAN   station currently     being     used,     number     in "FROM   TO"   display   will   be   set   to "0" when TACAN data is loaded. 2. Keys "7" and "9" Observe that number of  TACAN  station  used  for  navigation flashes    on    and    off    in    "TOFROM" display. Data displays indicate coordinates     of     station     selected     via thumbwheel. 3. Thumbwheel  Set  to  number  of  station being loaded.  (Insure thumbwheel is in detent). NOTE Station "O" cannot be loaded. 4. To load latitude Press keys in sequence, starting   with   "N"   or   "S"   to   indicate north   or   south.      Example:   42°   54.0' North = N 4 2 5 4 0.  Observe     that INSERT/ ADVANCE pushbutton annunciator  illuminates  when  first  key is pressed. 5. INSERT/ADVANCE pushbutton Press.  Observe pushbutton annunciator extinguishes. 6. To        load    longitude    Press    keys    in sequence,   starting   with   "W"   or   "E" indicating   west      or      east.      Example: 87°54.9' West = W 8 7 5 4 9.  Observe that  INSERT/  ADVANCE  pushbutton annunciator  illuminates  when  first  key is   pressed,   and   longitude   appears   in data display as keys are pressed. 7. INSERT/ADVANCE pushbutton Press.  Observe pushbutton annunciator extinguishes. 8. INSERT/ADVANCE pushbutton Press.      Observe   that   the   arc-seconds related to loaded latitude and longitude, to  nearest  tenth  of  a  second,  appear  in left and right data display, respectively. 9. If  extra  precision  coordinate  data  is  to be   inserted   Press   keys   in   sequence, starting  with  "N",  to  load  related  arc- second  values  for  latitude.    Example: 35.8' North = N 358. 10. INSERT/ADVANCE pushbutton Press.  Observe pushbutton annunciator extinguishes. 11. To load related arc-second values for longitude Press Change 2       3-59