TM 1-1510-218-10 3B-54 b.   ENTER key  –  Press.    The  modify data base page will display. 6.   Geographic regions no longer required – Delete as follows: a.   Cursor  4  key   –  Press  to  position over region. b.   CLR key – Press to delete the *. 7.   Data     base     for     desired     region     – Update. a.   Menu     item     (region)     desired     – Select as follows: (1)   Cursor  -  or  ¯  key  – Press to position cursor over menu item (region) desired. (2)   ENTER   key    –   Press.      The modify  elements  page  for  that region will display. The number proceeding BLKS AVAIL, indicates blocks of data base   memory   remaining   (for entire  data  base,  not  just  for region selected). NOTE There  are  a  total  of  10,000  blocks  of  data base  memory.    These  blocks  can  be  filled with any combinations of geographic regions  and  navigational  elements  within those  regions  as  long  as  the  total  blocks chosen do not exceed 10,000. 8.   Cursor    -     or    ¯     key     –    Press,    if necessary,  to  position  over  navaid  to be updated. 9.   ENTER key – Press. 10.   Repeat  steps  8  and  9,  as  necessary, to update other navaids. 11.   DAT key – Press once to return to the modify data base page.  Asterisks will now   display   to   the   right   of   regions updated. 12.   Repeat     steps     1     through     11,     as necessary,   to   update   other   desired geographic regions. 13.   DAT    key    –    Press    as    required    to display the DATA 2 menu page. 14.   Menu item 5  – Select as follows: a.   Cursor   -   or   ¯    key    –   Press   to position over menu item 5. b.   ENTER key  –  Press.    The  update data base page will now display. 15.   Cursor  -  or  ¯  key  – Press to position cursor over LOAD D/BASE?. 16.   ENTER  key   –  Press  to  initiate  data base loading. 17.   Diskette reject button  – Push to unlock diskette.    Remove  diskette  from  data loader     and     close     clear     protective cover. CAUTION Leaving an update diskette inserted in the data  loader  for  extended  periods  of  time will cause excessive wear to occur to data loader.      Also,   failing   to   keep   the   clear protective    cover    closed    could    allow    a foreign  substance  to  enter,  damaging  the mechanism or electronics.  (6)   Establishing Operational Status.  Refer to Table 3B -4 for Methods of Operation. 1.   OBS/LEG key  – Press as required to select method of operation. 2.   SNS key – Press as required to select desired sensor. 3.   MOD   key    –   Press   as   required   to select desired mode of operation. NOTE The   OBS/LEG,   SNS,   and   MOD   keys   will cause  the  control  display  to    immediately reflect the operational status change.   However,    the    system    will    not    actually activate  the  new  operational  status  for  a period  of  1  second.    Repeated  presses  of these keys during this 1-second period will reset the delay back to 1 second.