TM 55-1510-220-10 NOTE A  load  cycle  can  be  terminated  prior to   insertion   of   all   four   volumes   by moving data selector or thumbwheel. (b) Insertion of geographic waypoint coordinates: 1. Data selector UL WY PT.  If this is the first insertion into the selected waypoint   since   turn-on,   observe   data displays  indicate  "0".    Otherwise,  data displays indicate last coordinates inserted into the selected waypoint. 2. Thumbwheel  Set  to  waypoint  number to be loaded. 3. 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,  and  latitude  appears  in  left data display as keys are pressed. 4. INSERT/ADVANCE pushbutton Press. Observe pushbutton annunciator extinguishes. 5. To  load  longitude  Press  keyboard  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 display as keys are pressed. 6. INSERT/ADVANCE pushbutton Press. Observe pushbutton annunciator illuminates. 7. If    desired    to    insert    extra    precision coordinate data Press INSERT/ADVANCE pushbutton. Observe that arc-seconds for loaded latitude   and   longitude,   to   the   nearest tenth  of  a  second,  appear  in  left  and right data displays, respectively. 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 pushbutton Press. Observe pushbutton annunciator 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 pushbutton Press. Observe pushbutton annunciator 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:   "42'54.4   (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. Change 2  3-56