MIL-W-89500 (NOTICE-1), MILITARY SPECIFICATION: WORLD MAGNETIC MODEL (WMM) (22-APR-1998) [S/S BY MIL-PRF-89500A]

MIL-W-89500 (NOTICE-1), MILITARY SPECIFICATION: WORLD MAGNETIC MODEL (WMM) (22-APR-1998) [S/S BY MIL-PRF-89500A]., MIL-W-89500, dated 18 June 1993, is inactive for new design and is no longer used, except for replacement purposes.