TM 55-1510-222-10 sequence,   starting   with   N   or   S   to indicate north or south. Example:  42°  54.0' North =4 2 5 4 0.  Observe that INSERT/ADVANCE  pushbutton  annunciator  illuminates when first key is pressed. 5.  INSERT/ADVANCE pushbutton Press, observe pushbutton annunciator extinguishes. 6.        To    load    longitude    Press    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 data display as keys are pressed. 7.        INSERT/ADVANCE    pushbutton    - Press. Observe pushbutton annunciator extinguishes. 8.        INSERT/ADVANCE    pushbutton    - Press. Observe    that    the    arc-seconds    related    to    loaded latitude  and  longitude,  to  nearest  tenth  of  a  second, appear in left and right data display, respectively. 9.  If extra precision coordinate data is to be  inserted  Press  keys  in  sequence, starting  with  N,  to  load  related  arc- second values for latitude. Example: 35.8 North = N 358. 10.        INSERT/ADVANCE    pushbutton    - Press. Observe pushbutton annunciator extinguishes. 11.  To load related arc-second values for longitude   Press   keys   in   sequence, starting with E. Example: 20.1 East = E 201. 12.        INSERT/ADVANCE    pushbutton    - Press. Observe pushbutton annunciator extinguishes. NOTE In above example, if INSERT/ ADVANCE pushbutton is 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 displays are not rounded off. · The normal geographic coordinates must always be loaded    prior    to    extra    precision values. · 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    the values    will    be    added    to    extra precision   value   without   affecting direction. · 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. 13.        INSERT/ADVANCE    pushbutton    - Press. Observe     that     right     data     display     indicates     last previously   inserted   altitude,   and   left   data   display   is blank. 14.      To   indicate   the   following   load   is altitude - Press key 4 or 6. Observe  INSERT/ADVANCE  pushbutton  annunciator illuminates. 15.    To  load  altitude  first  Press  keys  in sequence. Example:    1230  ft  =  1230.    Numbers  appear  in  right data display as keys are pressed. NOTE Altitude inputs are limited to 15,000 feet. 16.        INSERT/ADVANCE    pushbutton    - Press. Observe pushbutton annunciator extinguishes. 17.      INSERT/ADVANCE      pushbutton   - Press. Observe that left data display indicates last previously inserted   channel   number,   and   right   data   display   is blank. 18.      To   indicate   the   following   load   is channel number Press key 2 or 8. 3-54