system.   Areas Link-16   system that  have  been  improved  under  the include  the  following: Number of Participants Track Numbers Track Quality Track Identification Friendly Status Granularity of Measurement Relative  Navigation Electronic Warfare Land Points and Tracks NUMBER OF PARTICIPANTS.—  The  number of units that can participate in a Link-16 net has been increased  dramatically  over  that  of  Link-11.  The JTIDS  Unit  number,  or  JU,  is  a  five-digit  octal number  from  00001  to  77777.  This  allows  for  a maximum of 32,766 possible JUs. Addresses 00001 to  00177  are  normally  assigned  to  units  that  have  the need and capability to participate in both Link-16 and Link-11.  When  a  unit  participates  in  both  Link-11 and Link-16, it must use the same address on both links. For example, Link-16 JU 00043 is the same as Link-11 PU 043. TRACK NUMBERS.— Link-16  replaces  the  old four-digit (octal) Link-11 track numbers with a five- character  alphanumeric  track  number. The  track number  can  be  within  the  range  00001  to  77777 (octal) or 0A000 through ZZ777. This allows for a maximum of 524,284 track numbers, compared with the 4,092 available with Link-11. One reason for the need for the additional track number is that Link-16 cannot  operate  in  the  track  number  pool  mode,  in which a common pool of track numbers is shared by several  PUs.  Every  JU  must  be  assigned  a  unique block of track numbers. To   maintain   interoperability   with   Link-11, Link-16   track   numbers   00200   through   07777 designate the same tracks as Link-11 track numbers 0200  through  7777. TRACK QUALITY.— The Track Quality (TQ) value used by Link-16 relates to the accuracy of the reported position of the track. The TQ has a range of 0 to 15. To achieve the highest track quality, the track must  be  within  50  feet  of  the  reported  position. Link-11  uses  the  update  rate  to  determine  track quality. Using Link-11, a track that is reported by a PU at every interrogation is usually assigned a TQ of 7 . TRACK  IDENTIFICATION.—  The  Link-16 system  greatly  expands  the  information  that  is reported with Track Identification (ID). The new ID reports include fields for platform, activity, specific type,  and  nationality  of  the  track. Additional provisions have also been added to identify a track as “Neutral,” and the Unknown Assumed Enemy ID is changed  to  “Suspect.” FRIENDLY  STATUS.—  The  Link-16  system also  provides  for  more  detailed  status  reports  from friendly  aircraft.  The  following  fields  are  added  to Link-16  friendly  status  reports:  equipment  status, ordnance inventory, radar and missile channels, fuel available for transfer, gun capability, and station ETA and ETD. INCREASED GRANULARITY.— Granularity refers to how precisely an item is reported in the link message. Link-16 has made major improvements in the granularity of reports concerning track position, air track speed, altitude, and lines of bearing. LINES  AND  AREAS.—  The  Link-16  system allows  the  reporting  of  multi-segment  lines  and  areas of   all   sizes   and   descriptions. Link-11,   for comparison,  only  allows  reports  of  areas  that  are limited  in  size  and  are  circles,  ellipses,  squares,  or rectangles. Link-11 does not have the capability to report  lines. GEODETIC  POSITIONING.—  The  Link-16 messages use the geodetic coordinate system to report 5-7