TM 1-1510-225-10 3A-55 NOTE The Sensor Message pages may be accessed  by  placing  the  cursor  over  the individual position sensor and pressing the ENTER key.  Use the NAV, PRV, or NXT key to  page  through  the  sensor  status  pages.   When  all  of  the  sensor  status  pages  have been   reviewed,   Navigation   1/4   page   will again be displayed. f.    GPS Subsection Pages.  (1)   GPS   Subsection   1/3   Page.      Refer   to Figure 3A-30. (a)   POS.        The    POS    (position)    fields display the current composite latitude and longitude in degrees, minutes, and hundredths of a minute. (b)   GPS.    The  GPS  (global  positioning system)    fields    display    current    GPS    latitude    and longitude  in  degrees,  minutes,  and  hundredths  of  a minute.    GPS  position  is  only  displayed  when  GPS  is in the NAV mode. (c)   DIF.    The   DIF   (difference)   between the    composite    position    and    the    sensor    computed latitude and longitude in degrees. Figure 3A-30.  GPS Subsection 1/3 Page (2)   GPS   Subsection   2/3   Page.      Refer   to Figure 3A-31. (a)   GPS HPE. The GPS HPE (horizontal    position    error)    field    displays    horizontal position error in nautical miles. (b)   GPS   TIME.      The   GPS   TIME   field displays  GPS  GMT  in  hours,  minutes,  and  seconds.   This  time  is  displayed  when  at  least  one  satellite  is being    tracked,    otherwise    the    time    field    displays dashes. Figure 3A-31.  GPS Subsection 2/3 Page NOTE GPS   TIME   may   vary   by   several   seconds from GMT due to leap second input of UTC (coordinated universal time). (c)   STATE.   This  field  displays  the  GPS receiver state. 1   Dashes  –  GPS  receiver  is  idle  or no mode data is available. 2   INITIALIZE  –  The  GPS  receiver  is updated with initial position and time information. 3   SKY   SEARCH    –       No    almanac available.      The   GPS   system   is   searching   for   any satellite  in  the  visible  table  based  on  the  internal  or external    time,    data,    and    position    and    will    assign channels in the order received. 4   ACQUISITION – Constellation selection, channel assignments, and carrier and code lock are in progress. 5   TRANSITION  –  The  GPS  receiver is transitioning from one state to another. 6   NAVIGATION  –  GPS receiver is in navigation  mode  and  has  at  least  a  two-dimensional position fix. 7   DR   –   The  GPS  system  is  in  the Dead  Reckoning  (DR)  mode.    When  GPS  position  is valid and sufficient satellite measurements are unavailable,  the  GPS  receiver  will  continue  to  output valid position information for a maximum of