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Data updated: 13 May 2026.
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Document ID:
MIL-PRF-89500
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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
FSC/Area:
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.
Media
Document Part Description
Dist Stmt
Document Date
Pages
Size
Revision B
A
28-FEB-2019
24
875.3 KB
Revision A
A
30-OCT-2015
22
578.9 KB
Notice - Administrative
A
31-MAR-2004
1
6.2 KB
Notice 1 - Inactivation
A
22-APR-1998
1
2.1 KB
Base Document
A
18-JUN-1993
40
2902.8 KB
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Defense Standardization Program
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.