Data Item Format WIC Item APS4/II APS4/III Description Comment
grp_id 9(9) 45 x x unique identifier of the group PK seq_no 9(4) x x sequence number PK see note 1 freq_sym X 53 x x symbol indicating kilohertz [K] megahertz [M] or gigahertz freq_assgn 9(5).9(5) 53 assigned frequency grp_id 9(9) 45 x x unique identifier of the group PK freq_mhz 9(6).9(6) frequency in MHz derived data