TM  1-1520-240-10 3-3-34            Table  3-3-4.   Map Datum Codes - (Continued). Map Datum Data Code SD, INDIAN SPECIAL 42 SD, LUZON SPECIAL 43 SD, TOKYO SPECIAL 44 SD, WGS-84 SPECIAL 45 WGS-72 46 WGS-84 (Default map datum) 47 3-3-53.  GPS Data Loader Receptacle.  (fig. 3-3-9) The GPS data loader receptacle allows the operator to load  pre-programmed  navigation  information  into  the GPS receiver. This navigational information, such as way point position, DTM or almanac data is pre-loaded on a data   loader   module,   part   number   164191-01-02   or 164191-03-01, if Unit Operations and mission dictates. 3-3-54.  Controls  and  Function  -  GPS  Data  Loader Receptacle. Controls  of  the  GPS  Data  Loader  Receptacle  are  as follows: CONTROLS/ INDICATOR FUNCTION RELEASE Pushbutton When Pressed, releases Data Loader Module from Data Loader Receptacle. 3-3-55.  Normal Operation - GPS Data Loader Recep- tacle. Perform the following steps in sequence to operate the data loader system: a.  Turn on the GPS System. Allow system to warm up and time in for approximately one minute. NOTE Loading  data  loader  must  be  done  in  INIT Mode. b.  Insert data loader module into data loader recep- tacle. Wait at least 30 seconds before switching to anoth- er mode. Display momentarily flashes when information has been successfully transferred. c.  Locate module release button on left side of data loader  receptacle.  Release  and  remove  data  loader module from data loader receptacle. d.  Verify operation of data loader system by: (1) Turn GPS Data Select switch to POS. (2) Select a way point that is known to be pre- programmed. (3) Compare  data  displayed  with  known  pro- grammed data. (4) If other selections are to be checked, rotate  Data  Select  switch  to  position  desired.  Then compare  data  displayed  with  the  known  programmed data. (5) Repeat steps (1) thru (5) as desired for any or all remaining way points. (6) GPS  should  now  be  ready  for  use  during flight operations. 3-3-56.  GPS KYK-13 Remote Fill Panel.  (fig. 3-4-2) The GPS KYK-13 Remote Fill Panel allows encryption data to be loaded from a KYK-13 or KOI-18 fill devise. Reference will only be made to the KYK-13. 3-3-57.  Controls  and  Function  -  GPS  KYK-13  Re- mote Fill Panel.  (fig. 3-4-2) Controls of the GPS KYK-13 Remote Fill Panel are as follows: CONTROLS/ INDICATOR FUNCTION LOADS STATUS LED Provides positive indication that GPS receiver has successfully received crypto key fill. INIT LOAD switch When pressed, causes the transfer of crypto key from fill devise (KYK-13 or KOI-18) to GPS receivers 3-3-58.  Normal Operation - GPS KYK-13 Remote Fill Panel. To load keys from KYK-13 into the GPS receiver: NOTE The GPS receiver does not need to be on to load keys with the KYK-13 Fill Devise. a.  Connect  KYK-13,  either  directly  or  using  a  fill cable, to KYK/GPS FILL J1 receptacle located on the Remote Fill Panel (Figure 3-4-2). b.  Turn KYK-13 Fill switch to desired position. c.  Turn KYK-13 Mode switch to ON. d.  Press LOAD INIT switch on the Remote Fill Panel (Figure 3-4-2). Wait approximately 5 seconds. If key was successfully loaded, Load Indicator light on the Remote Fill Panel will flash.