TM 55-1510-222-10 always  interpret  such  entries  as an E input.  E will be displayed in normal UTM data display. · 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 precision display.    In  other  words,  there  is no    rounding    between    the    two displays. 14.        INSERT/ADVANCE    pushbutton    - Press. Observe  right  data  display  indicates  last  previously inserted altitude, and left data display is blank. 15.      To   indicate   the   following   load   is altitude - Press keys 4 or 6. Observe  INSERT/ADVANCE  pushbutton  annunciator illuminates. 16.  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.        INSERT/ADVANCE    pushbutton    - Press. Observe pushbutton annunciator extinguishes. 18.        INSERT/ADVANCE    pushbutton    - Press. Observe that left data display indicates last previously inserted channel number, and right display is blank. 19.  To indicate following load is channel number - Press keys 2 or 8. Observe  INSERT/ADVANCE  pushbutton  annunciator illuminates. 20.  To load channel number Press keys in sequence. Example:    109  =  109.    Observe  number  appears  in left data display as keys are pressed. 21.        INSERT/ADVANCE    pushbutton    - Press. Observe pushbutton annunciator extinguishes. 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. · Channel number has an implied X suffix. · Degree     symbol     (^o)     should     be disregarded when reading altitude and data display. 22.        INSERT/ADVANCE    pushbutton    - Press. Observe station 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. (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  TO- FROM  display  will  be  set  to  0  when TACAN data is loaded. 2.  Keys 7 and 9 Press simultaneously. Observe  that  number  of  TACAN  station  being  used for navigation, flashes on and off in TO-FROM display. Data  displays  indicate  coordinates  of  station  selected via thumbwheel. 3.  Thumbwheel Set to number of station being loaded.  (Ensure thumbwheel is in detent.) NOTE Station 0 cannot be loaded. 4.  To load latitude - Press keys in 3-53