TM  55-1510-221-10 NOTE Extra   precision   values   are   always   added to  normal  values  regardless  of  which  key (N/S)  is  pressed  to  initiate  the  entry.  The normal   entry   establishes   the   hemisphere. 10.   INSERT/ADVANCE   push- button  -  Press.  Observe  lati- tude  and  longitude  data  is displayed in UTM and INSERT/   ADVANCE   push- button   light   extinguishes. NOTE The  computer  will  convert  coordinates  in the   overlap   area;   however   display   values will   reference   appropriate   zone. NOTE The  “W“  key  may  be  used  to  initiate  east- ing  entries;  however  computer  will  always interpret  such  entries  as  an  “E“  input.  “E“ will  be  displayed  in  normal  UTM  display. NOTE Extra   precision   values   are   always   added to   normal   values.   As   an   example,   South 4,476.995  m  will  display  “4476S“  in  nor- mal  display  and  “995“  in  extra  precision display.  There  is  no  rounding  between  the two  displays. (b.)   To   insert   geographic   coordinates of  aircraft  present  position: NOTE Prior   to   pressing   INSERT/ADVANCE pushbutton,   any   incorrectly   loaded   data can  be  corrected  by  pressing  the  CLEAR pushbutton   and   loading   correct   data. 1. Data   selector   -   L/L   POS. Observe  that,  prior  to  initial load, the INSERT/ ADVANCE  pushbutton  light is   illuminated. 2. To  load  latitude  data  -  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   latitude appears   in   left   data   display as  keys  are  pressed. 3.  INSERT/ADVANCE  push- button -  Press.  Observe pushbutton   light   remains illuminated. 4.   To   load   longitude   data   - Press  keys  in  sequence,  start- ing  with  “W”  or  “E”  to  indi- cate   west   or   east.   Example: 87°54.9’  West  =  W  8  7  5  4 9.   Observe   that   longitude appears  in  right  data  display as  keys  are  pressed. 5.  INSERT/ADVANCE  push- button -   Press.   Observe pushbutton light extin- guishes. 6. Data  selector  -  DSRTK/STS. Confirm: a. Left   data   display   indi- cates desired track angle in computer memory. b. Right  data  display  indi- cates  --84,  -74,  -64, or   --54,   depending   on which   alignment   state the computer has reached. NOTE After   present   position   has   been   inserted and  computer  has  advanced  to  state  “7“, present   position   cannot   be   reinserted without   downmoding   to   STBY   and restarting   alignment. 7. Data selector (CDU) - DSRTK/STS.   Observe   left- hand   data   display   indicates the   desired   track   in   com- puter  memory  and  right  data display indicates status "-194“. 3-52