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   Data updated: 13 May 2026. Home |  About Quick Search |  ASSIST |  ASSIST Updates Document Details

Document ID:   MIL-PRF-89500       Scroll down to access document images

Overview
Title:  World Magnetic Model (WMM)
Scope:  This specification is designed to provide guidelines for the preparation and use of the World Magnetic Model (WMM) and the charts and grid tables derived from the model. This specification also provides guidelines for the preparation and use of computer programs and subroutines that compute the model magnetic field elements, namely the declination (D), inclination (I), total intensity (F), horizontal intensity (H), and grid variation (GV) at given locations and times.
Status:  Active Document Date:  28-FEB-2019      
  Next Review Due:  27-FEB-2024
GINT Doc Category:   Performance Specification  

Responsibilities
Lead Standardization Activity:  U/A  LSA Unassigned  
  Preparing Activity: MP  The National Geospatial-Intelligence Agency, (DepSO)
Coordination:  Full  
Army Custodian:  AV   Combat Capabilities Development Command, Aviation and Missile Center  
Navy Custodian:  NO   Deputy Chief of Naval Operations (Intelligence)  
Air Force Custodian:  09   AF/A2 Targeting & GEOINT Capabilities Division  
Other Custodian:  MP   The National Geospatial-Intelligence Agency, (DepSO)  

Projects
 Project Number:     GINT-2025-001

Amendments to military specifications or specification sheets issued after August 1, 2003 are incorporated in the modified document.
Revision History Click on column headings for a description of column content.
MediaDocument Part DescriptionDist StmtDocument DatePagesSize
Document ImageRevision B A28-FEB-201924875.3 KB
Document ImageRevision A A30-OCT-201522578.9 KB
Document ImageNotice - AdministrativeA31-MAR-200416.2 KB
Document ImageNotice 1 - InactivationA22-APR-199812.1 KB
Document ImageBase Document A18-JUN-1993402902.8 KB

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WARNING: UNAUTHORIZED ACCESS TO THIS UNITED STATES GOVERNMENT COMPUTER SYSTEM AND SOFTWARE IS PROHIBITED BY PUBLIC LAW 99-474 (THE COMPUTER FRAUD AND ABUSE ACT OF 1986) AND CAN RESULT IN ADMINISTRATIVE, DISCIPLINARY OR CRIMINAL PROCEEDINGS.