TM 1-1510-218-10 3-23 plan  is  reached.    Pushing  the  right  inner  knob  in  will remove the window from the display. 9.0 NM LRP ENR-LEG 200 KT ETE0:03 DTK113^o TK113^o 40 AB LRP . . APG LRP LOX BZJ RAV ETX Figure 3-18.  Super NAV 5 Page (Active Waypoint Identifiers) The  Super  NAV  5  page  can  be  configured  to display   the   VNAV   status.      This   means   the   VNAV status    and    advisory    altitude    for    VNAV    can    be displayed   on   the   Super   NAV  5  page.    The  VNAV problem still needs to be set up on the NAV 4 page. CAUTION Advisory    VNAV    operation    will    only    be accurate if the barometric altimeter setting is kept updated. (7)   Setting Up The VNAV Situation From The NAV 4 Page. 1.   Turn   to   the   Super   NAV  5  page  by selecting  NAV  5  on  both  sides  of  the display. 2.   Turn  on  the  left  cursor  and  rotate  the left  outer  knob  counterclockwise  until the  cursor  is  over  the  third  line  from the bottom of the display. 3.   Rotate  the  left  inner  knob  until  VNAV is displayed.  Turn the left cursor off. 4.   The   Super   NAV   5   page   will   now display the VNAV status.  If the VNAV problem   has   not   been   defined   yet, then  V  OFF  will  be  displayed.    If  the time    to    start    VNAV    operation    is greater  than  10  minutes,  V  ARM  is displayed.    When  the  time  to  VNAV operation is less than 10 minutes, the time until VNAV operation will start will be   displayed,   e.g.,   V   4:53.      If   the VNAV operation has started, a suggested  altitude  will  be  displayed, e.g., V 4300. CAUTION Failure   to   keep   the   barometric   altimeter setting   updated   will   result   in   inaccurate special use airspace alerting. The KLN 90B's special use airspace alert is only  a  tool  to  assist  the  pilot  and  should never be relied upon as the sole means of avoiding these areas.  NOTE Special   use   airspace   alerting  is  disabled when   in   the   approach   arm   or   approach active modes.  s.      Special Use Airspace Alert.  The KLN 90B contains the location of areas of special use airspace.   A message prompt is used to alert proximity to special use  airspace.    When  the  message  page  is  viewed,  it will display AIRSPACE ALERT and the name and type of the special use airspace.  If the special use airspace is  a  Class  B,  Class  C,  CTA,  or  TMA,  the  message page  will  include  instructions  to  see  the   APT  4  page for  the  primary  airport  for  the  correct communications frequency. The  special  use  airspace  alert  feature  is  three- dimensional.    The  areas  are  stored  in  the  database with    regard    to    altitude    when    the    actual    altitude limitations  are  charted  in  terms  of  Mean  Sea  Level (MSL).  Therefore, for flight above or below an area of special use airspace there will be no alert.  If the actual lower  limit  is  charted  in  terms  of  an  altitude  Above Ground Level (AGL), it is stored in the KLN 90B as all altitudes below the upper limit.  If the actual upper limit is charted in terms of AGL, it is stored in the KLN 90B as unlimited. The  types  of  areas  stored  in  the  database  and the   abbreviations   used   to   denote   these   areas   are listed in Table 3-4. Only  the  outer  lateral  boundaries  are  stored  for Class  B,  Class  C,   CTA,  and  TMA  airspace.    These special use airspace areas are stored as cylinders of airspace so all altitudes below the upper limit of these areas are considered to be in the area. Table 3-4.  Special Use Airspace   DISPLAY EXPLANATION ALRT Alert Area CAUT Caution Area CL B Class B