TM 1-1510-225-10 3A-84 1.   NAV key – Press. 2.   FR    waypoint    –    Verify.        The    first waypoint  on  the  active  flight  plan  will appear in the FR field.  To change the FR waypoint, insert the desired identifier. 3.   ENTER    key    –    Press.        The    next waypoint    in    the    active    flight    plan sequence will appear in the  TO field. 4.   TO waypoint  – Verify.  To change the TO waypoint, insert the desired identifier. 5.   ENTER key – Press. 6.   DIS, DTK – Check. (14)   Manual Primary Navigation Mode Selection.    This  procedure  is  used  to  manually  place the  system  into  the  primary  navigation  mode  at  the designated departure position.  The GPS must track at least  four  satellites  in  order  to  navigate,  but  can  also navigate in a degraded mode with three satellites and an external altitude input (air data computer). 1.   MSG key – Press. 2.   NAV RDY, HOLD/ENTER message  – Verify.    This  message  indicates  that the    system    is    ready    to    enter    the primary navigation mode. 3.   MSG key – Press to verify status of all sensors. 4.   HOLD  key  – Press to verify departure coordinates. 5.   ENTER  key    –   Press   twice   to   enter primary navigation mode. (15)   En Route. (a)   Direct To Active Flight Plan Waypoint.  The direct to key function enables the pilot to fly directly to any waypoint on the active flight plan without reinserting the waypoint identifier. 1.    D      key   –  Press.    A  Direct    To page  will  appear  with  the  cursor over the current TO waypoint. 2.   Line select key – Press to position the cursor over the desired identifier. NOTE Active flight plans exceeding 18 waypoints will   be   continued   on   subsequent   pages.   Press   D   key, NXT, or PRV key to access remaining waypoints.  3.   ENTER   key   –   Press.      Display automatically advances to   NAV 1 page. NOTE The  system  must  compute  a  turn  from  a wings level position.  If the aircraft is in a turn   when   the   D      key   is   pressed,   the aircraft  will  roll  to  a   wings  level  position momentarily. The aircraft will then continue  the  turn  toward  the  DIRECT   TO waypoint. If   an   offset   waypoint   was   selected,   an OFFSET   WPT   page   is   displayed.      Verify data and press ENTER.  The Direct To page is     displayed     with     cursor     over     offset waypoint. Press ENTER. Display automatically advances to NAV 1 page. 4.   DIS, DTK – Check. (16)   Direct  To  HP  Waypoint.    This procedure enables   the   pilot   to   proceed   DIRECT   TO   the   HP waypoint  on  the  active  flight  plan  and  select  or  cancel the  holding  pattern  or  procedure  turn  programmed  at the waypoint. NOTE Active flight plans exceeding 18 waypoints will   be   continued   on   subsequent   pages.   Press direct to, NXT, or PRV key to access remaining waypoints.  1.    D   key – Press.  A Direct To page will appear    with    the    cursor    over    the current TO waypoint. 2.   Line select key – Press to position the cursor over the desired HP identifier. 3.   ENTER  key   –  Press  to  display  the Holding   Pattern   page   with   both   the OK? ENTER and CANCEL option. To select and go directly to HP waypoint: 4.   ENTER key – Press. Display automatically    advances    to    NAV    1 page. 5.   ENTER key – Press.