TM 1-1510-218-10 3-13 Airports that have four-letter identifiers require all four letters.  Turn the knob either  clockwise  or  counterclockwise.   The letters and numbers wrap around with  a  blank  character  separating  the 9 and the A.  Turn the knob clockwise to   scan   through   the   characters   in alphabetical order or counterclockwise to  scan  in  reverse  alphabetical  order.   Numbers  are  considered  lower  than letters.   4.   Rotate  the  right  outer  knob  one  step clockwise  to  position   the  cursor  over the second character of the identifier. 5.   Use the right inner knob to select the second character of the identifier. 6.   Use   the   right   outer   and   right   inner knobs  in  the  same  manner  as  above to select the remainder of the identifier. 7.   Press     the     right     CRSR     button     to remove the cursor from the right page. 8.   If the waypoint is an airport, the APT 2 through  APT  8  pages  may  be  viewed by rotating the right inner knob.  Many times  not  all  of  the  characters  of  a waypoint identifier need to be entered.   Every time a character is entered, the KLN   90B   searches   its   database   to offer the first waypoint in the database that  begins  with  the  characters  that have been entered so far. (2)   Selecting Waypoints By Scanning. 1.   Select  the  desired  waypoint  type  on the  right  side  by using the right outer knob. 2.   Pull  the  right  inner  knob  to  the  “out” position. 3.   Turn the right inner knob clockwise to scan through the waypoints in alphabetical order or counterclockwise to  scan  in  reverse  alphabetical  order.   Numbers   are   considered   lower   than letters.   The  faster  the  knob  is  turned, the     larger     the     step     through     the waypoints. This variable rate scanning allows quick movement through  the  list.    When  the  knob  is turned     slowly,     the     waypoints     are scanned one at a time. A   list   of   the   nine   waypoints   nearest   to   the present   location   is   located   at   the   beginning   of   the complete  lists  for  airports,  VOR's,  and  NDB's.    It  is necessary  to  scan  backwards  by  turning  the  knob counterclockwise  through  the  complete  list  to  reach the nearest list.  The top right  portion  of  the  page  will flash   the   relative   position   of   the   waypoint   to   the present   position,   Figure   3-7.      NR   1   indicates   the nearest    while    NR    9    indicates    the    ninth    nearest.   Waypoint  pages  displayed  in  the  nearest  list  do  not contain latitude or longitude positions as they do in the complete list.  Instead, the bearing and distance to the waypoint  are  displayed.    In  addition,  nearest  airport pages  display  the  length,  surface,  and  lighting  of  the longest runway.  Once the nearest airport is displayed, the other airport pages for the airport are available for display by making sure the right inner knob is pressed in and then turning it to select the desired airport page. Figure 3-7.  Nearest Airport Page NOTE The  capability  to  display  nearest  airports exists  only  when  the  KLN  90B  is  actually operating in the primary database coverage  area.    For  example,  if  the  KLN 90B contains a North American database, it will  not  display  the  nearest  airports  while operating in South America. In    the    event    of    an    emergency,    a    special procedure exists to very quickly get to the beginning of the nearest airport list. 1.     MSG button - Press. 2.     ENT button  - Press.