from a receiver site at 103.4°W longitude, 23.0°N latitude.  The D value  of  28.4°  is  the  difference between 103.4° and 075.0°, ignoring the sign. The antenna elevation is about 48 degrees, and the azimuth on the NW scale is 126 degrees. INTERNET In recent years, the Internet has become a very efficient  method  of  acquiring  satellite  imagery.  The worldwide web is the fastest way to acquire a wide variety of real-time satellite imagery. NOAA/NEDSIS has  its  own  website  (NOAASIS)  along  with  several private  companies  and  universities.  Of  particular importance is that these sites can be reached aboard ships equipped with Internet access. FNMOC can also transmit satellite imagery over the military Internet (NIPRNET and SIPRNET). This imagery can then be viewed using Joint METOC Viewer (JMV) software with any computer system able to process the data. Details on the JMV and the NIPRNET/SIPRNET routing networks is covered in later modules. The Naval Research Laboratory in Monterey, California, has an outstanding Internet homepage that provides a tremendous  amount  of  satellite  imagery  data.  It contains general information relating to environmental satellites and provides guidance packages for new and experimental  satellite  products.  The  website  also provides  links  to  various  other  satellite  imagery sources. AUTODIN  MESSAGE The  Automatic  Digital  Network  (AUTODIN)  is the U.S. Navy’s most common method of transmitting message traffic between commands. Satellite images can also be sent via AUTODIN in greatly compacted form. This method is only used in rare cases, most often  used  by  at-sea  platforms  with  little  or  no environmental satellite reception capability and no Internet access. Portions ofreceived images that are of interest to a ship can be extracted, compacted, encoded for transmission, and sent via AUTODIN link to the ship from any other command (normally Meteorology and  Oceanography  centers).  The  AUTODIN  encoded images are then available for reprocessing and display by   the   ship.   Requests   for   satellite   imagery   via AUTODIN are carried out on a case-by-case basis. Requests  should  be  limited  to  information  that  is essential to operations, as too much data will slow other AUTODIN message traffic. Q30. Q31. Q32. Q33. Q34. Q35. Q36. Q37. Q38. REVIEW  QUESTIONS Which U.S. Government agency provides HF broadcasts of satellite imagery? What type of satellite imagery is available from NODDS? How  is  satellite  imagery  acquired  by  most shore-based  weather  stations? What is the purpose of a satellite looper? What is the advantage of APT direct-readout imagery? How does the resolution between APT and HRPT data compare? What type of information is available from the WEFAX broadcast? What is the fastest way to acquire a wide variety of satellite imagery? How can units with no environmental satellite reception capability or Internet access still receive satellite imagery? SATELLITE  RECEIVER  SYSTEMS LEARNING  OBJECTIVES:  Identify  the  two primary  satellite  receiver  systems  used  to acquire direct-readout imagery and WEFAX products. Identify the operator’s manuals that provide detailed instructions for use of the systems. Two  satellite  receiver  systems  are  routinely operated  by  Navy  and  Marine  Corps  weather observers. The AN/SMQ-11 system is used at major shore installations and aboard all aircraft carriers. Navy Mobile Environmental Teams (METS) use the optional satellite module of the IMOSS to receive satellite  imagery. AN/SMQ-11  METEOROLOGICAL DATA SET The  AN/SMQ-11  satellite  receiver  station  is installed aboard most U.S. Navy ships staffed by Aerographer’s Mates, at many Naval Meteorology and Oceanography Command activities, and in Marine Corps Mobile Meteorological Vans (METVANs). The ANISMQ-11 may receive, process, display, grid, and enhance DMSP imagery and both APT and HRPT 1-27