TM 1-1510-225-10 3B-165 Figure 3B-135.  Model Aircraft Page Access and Usage Table 3B-100.  Model Aircraft Page Access and Usage   NO. DESCRIPTION/FUNCTION 1 Pressing  IDX   function  key  will  access the index page. 2 Scroll to index 2 page. 3 Accesses model aircraft page. 4 Inserts the model altitude. 5 Inserts the model wind. 6 Inserts the model true airspeed. Table 3B-100.  Model Aircraft Page Access and Usage  (Continued) NO. DESCRIPTION/FUNCTION 7 Inserts    the    heading;    toggle    heading mode     between     flight     plan     Steering (STR) and Heading Hold (HLD). 8 Toggle   the   line   select   key   for   either RUNNING or STOPPED modes. x.   Postflight Operations.  (1)   Postflight    Operations    Overview.        The FMS-800 postflight operations are as follows: 1.   Saving    and    clearing    GPS    selective availability/anti-spoofing keys. 2.   Saving GPS almanac data. 3.   Saving system status data. 4.   Zeroizing system data. 5.   Locking the system. (2)   Saving     and     Clearing     GPS     Selective Availability/Anti-Spoofing   (SA/AS)   Keys.      The  GPS SA/AS   functions   are   controlled   on   the   GPS   SA/AS page,  which  is  accessed  from  the  Index 1 page.  The GPS  SA/AS  page  indicates  whether  or  not  the  GPS contains   keys   and   the   current   mission   duration   as reported by the GPS.  To change the mission duration, enter the number of days in the scratchpad and press the  DAYS  line  select  key  on  the  GPS SA/AS page.   Entering  a  duration  less  than  the  current  number  of loaded daily keys will zeroize any keys exceeding the desired mission duration. To zeroize the SA/AS keys, access the Lock/Zeroize page and press the  ZERO ALL or  GPS line  select  key  twice.     If  after  a  zeroize  attempt  the GPS SA/AS keys were not zeroized, for any reason, a NO   KEYS   ZERO   annunciation   appears.      If   it   was zeroized, a SAFE KEYS annunciation will be displayed. (3)   Saving  GPS  Almanac  Data.    Saving  the GPS  almanac  data  to  the  data  cartridge  can  ensure almanac data is available to reduce acquisition time for following flights.  To save the GPS almanac data, first access   the   Data   Loader   page   and   then   press   the ALMANAC SAVE line select key twice. (4)   Saving  System  Status  Data.    The  FMS- 800   maintains   an   in-flight   fail   history   of   all   avionic