TM 55-1510-220-10 (6) 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  WY PT. 2. Keys "7" and "9" Press simultaneously. Observe     that     number     of     TACAN station     being     used     for     navigation flashes    on    and    off    in    "TOFROM" 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 detent. b.   Station     "O"     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 "TOFROM" 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. e.   To    load    northing    Press  keys  in sequence, starting with "N" or  TM 55-1510-220-10      "S"   to   indicate north or south  hemisphere.    Example:  4749 North   =   N   4749.      Observe   that northing   kilometers   appear   in   left data display as keys are pressed. f. INSERT/ADVANCE pushbutton Press. Observe pushbutton annunciator remains illuminated. g.   INSERT/ADVANCE pushbutton 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 alternately displayed. h.   To    load    extra    precision    easting value     Press     keys     in     sequence, starting with the "E".  Example: 297 m   East   =   E   297.      Observe   that easting  meters  appear  in  right  data display as keys are pressed. i. INSERT/ADVANCE pushbutton Press.    Observe  pushbutton  remains illuminated. j. 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   normal value regardless of which key (N/S) Change 2    3-57