TM 55-1510-219-10 8. To    load    related    arc-second values for latitude -Press keys in sequence, starting with "N". (Example: 35.8" North = N 358.) 9. INSERT/ADVANCE push- button- Press. (Observe pushbutton light extinguishes.) 10. To    load    related    arc-second values    for    longitude    -Press keys    in    sequence,    starting with "E". (Example: 20.1" East = E 201.) 11. INSERT/ADVANCE push- button - Press. (Observe pushbutton light extinguishes.) 12. Repeat steps 2 through 11 for each waypoint to be loaded. NOTE In      above      example,      if      INSERT/ ADVANCE   pushbutton   was   pressed, the   following   normal   display   would appear:  "42°54.5  (N)"  and  87°54.3(W). The  extra  precision  values  are  added to   normal   values   and   normal   data displays are not rounded off. NOTE The   normal   geographic   coordinates must  always  be  loaded  prior  to  extra precision values. NOTE The  directions  "N"  or  "S"  and  "E"  or "W"   are   established   during   normal coordinate  entry.    Either  key  may  be used    to    initiate    entry    during    extra precision   loads   and   values   will   be added   to   the   extra   precision   value without affecting direction. 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. (11)    To insert TACAN coordinates: (a)    Insertion   of   UTM      TACAN   station 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 WYPT. 2. Keys    "7"    and    "9"    -    Press simultaneously. (Observe  that  number  of  TACAN  station  being  used for  navigation  flashes  on  and  off  in  "TO"  display  and data displays indicate coordinates of station selected by thumbwheel.) 3. Thumbwheel  -  Set  to  number of station to be loaded. Confirm: a. Thumbwheel     is     in     de- tent. b. Station "0" cannot be loaded. (Observe  that  if  number  of  station  to  be  loaded  is same  as  number  of  the  TACAN  station  currently  being used,  number  in  "TO"  display  will  be  set  to  "0"  when TACAN data is loaded.) c. To load zone and easting - Press keys in sequence, starting with "E". (Example:    Zone    16,    425    km    East    =    E16    425. Observe  that  zone  and  easting  in  kilometers  appear  in the right display as keys are pressed.) d. INSERT/ADVANCE pushbutton - Press. (Observe that pushbutton light is illuminated.) 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 Northing  kilometers  appear  in  left  data  display  as  keys are pressed.) e. INSERT/ADVANCE pushbutton - Press. (Observe pushbutton light remains illuminated.) 3-54