TM 55-1510-220-10 is   pressed   to   initiate   entry.      The normal entry establishes hemisphere. k.   INSERT/ADVANCE pushbutton Press.  Observe that during the next I     to     3     seconds,     the     computer converts    input    into    latitude    and longitude   for   storage   in   memory. The  stored  value  is  again  converted back    to    UTM    for    display        to operator. The INSERT/ ADVANCE pushbutton annunciator extinguishes. The conversion      routines      may  cause data displays to change by up to 10 m. NOTE The computer will convert coordinates in overlap area; however data display values will reference appropriate zone. NOTE The  "W"  key  may  be  used  to  initiate easting entries; however, the computer   will   always   interpret   such entries  as  an  "E"  input.    "E"  will  be displayed in normal UTM data display. NOTE 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. l. INSERT/ADVANCE pushbutton Press.    Observe  right  data  display indicates    last    previously    inserted altitude    and    left    data    display    is blank. m.  To   indicate   the   following   load   is altitude    Press    keys    "4"    or    "6". Observe INSERT/ ADVANCE pushbutton annunciator illuminates. n.   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. o.   INSERT/ADVANCE pushbutton Press. Observe pushbutton annunciator extinguishes. p.   INSERT/ADVANCE pushbutton Press.  Observe that left data display increases    last    previously    inserted channel  number,  and  right  display is blank. q.   To      indicate      following   load   is channel  number  Press  keys  "2"  or "8".  Observe INSERT/ ADVANCE pushbutton annunciator illuminates. r.    To  load  channel  number  Press  keys in  sequence.    Example:  109  =  109. Observe number appears in left data display  as  keys  are pressed. s.    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. Change 2  3-58