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AGeoP-24
An engineering or geospatial team at a national authority or defence contractor that has to install the World Magnetic Model in a system or apply it to a geographic product
AGeoP-24 sets the World Magnetic Model as NATO's standard model of Earth's magnetic field for military systems and geographic products, and fixes how magnetic declination must be shown on maps and charts.
AGeoP-24 is the NATO Allied Geographic Publication that establishes the World Magnetic Model (WMM) as NATO's standard global model of the Earth's magnetic field, "to be installed in instrumentation and to generate data for geographic products". It is promulgated under STANAG 7172: "The agreement of nations to use this publication is recorded in STANAG 7172." AGeoP-24 binds nations rather than suppliers directly, and reaches a contractor only where a national programme or a contract calls for it. The document lists the applications the model covers: navigation, three-dimensional attitude determination, magnetic signature reduction for naval vessels, magnetic detection, and communications equipment. The current edition is Edition A, Version 1, promulgated March 2017; as a first edition, it names nothing it superseded.
Nations agree "to use the World Magnetic Model for any system that needs a global model to be installed in order to maintain interoperability of systems", and to "ensure that the World Magnetic Model is installed in a format that allows the model to be updated easily whenever a new model is produced". The model itself comes from the US National Geospatial-Intelligence Agency (NGA) or the UK Defence Geographic Centre (DGC); a user registers the requirement with either organisation to receive each new model as it is produced. Anyone needing more accurate or real-time geomagnetic information than the World Magnetic Model provides is told to contact the specific country or the model's supplier directly, rather than adapt the standard model. The specification behind the current model is named as U.S. MIL-PRF-89500A, dated 30 October 2015.
Geomagnetic information has to appear on a geographic product in one of five forms, matched to the product type: a Three-Norths diagram for topographic maps, isogonals for air charts and small-scale nautical charts, isogrivs for air charts carrying a navigational grid, a compass rose for nautical charts, or the Magnetic Variation (MAGVAR) object for electronic navigational charts and Additional Military Layers. Whichever form is used, the date of the geomagnetic information has to be given along with the annual rate of change, with the date fixed by the relevant product specification. Isogonals only appear where at least two would be plotted on the chart; otherwise a marginal note gives the approximate declination instead. Isogrivs do the same job for polar charts, using grid north where declination varies too fast for isogonals to stay legible. A compass rose carries the declination in degrees and decimals, the date, and the annual rate of change in minutes per year. The preferred format for the Three-Norths diagram itself is set out in STANAG 3676, not in AGeoP-24.
For global products and series, nations use the relevant epoch of the World Magnetic Model. For national or regional products, they may use the latest World Magnetic Model or, where one is available and more accurate, a local magnetic model instead.
The document's own glossary explains the reason behind the update requirement: the annual change in magnetic declination "is not constant with respect to time, which is why the model must be replaced periodically". A system or product built around a fixed, unreplaceable model goes out of date on its own, regardless of how accurate it was when installed.
AGeoP-24 is a technical, operational standard, not a management system: it sets which magnetic model to install and how to depict it, and that work happens in navigation-system engineering and cartographic production, not in software. What ComplyTrain supports is the evidence trail around it: a controlled procedure for recording which World Magnetic Model version is installed where, when it was last updated, and the registration with the NGA or DGC that keeps new releases coming. It is also a place to hold the sign-off that a geographic product's declination note - Three-Norths diagram, isogonal, isogriv, compass rose or MAGVAR attribute - carries the correct date and annual-change figure before the product ships.
What ComplyTrain does not do: it does not compute magnetic declination, generate World Magnetic Model coefficient data, or produce or verify a chart's cartography. That stays specialist geospatial and navigation-engineering work.
Which tier of standard applies to a given system or product is set by the contract and the customer's quality clause, not by us. See what else sits alongside AGeoP-24 in the standards explorer, and talk to us about the evidence trail behind a geomagnetic-model update.
Tell us how you need to work with AGeoP-24 and what you need from it. We will come back to you about what ComplyTrain can do.
Thank you. Your list is on its way to your inbox, and we will come back to you on what working with these standards in ComplyTrain involves, usually within one business day.
Not directly. AGeoP-24 binds nations through STANAG 7172, the agreement recording their commitment to use the World Magnetic Model; a supplier meets it only where a national programme or a contract calls for conformance with it.
The World Magnetic Model (WMM), which AGeoP-24 establishes as NATO's standard global model of the Earth's magnetic field for installation in systems and for generating data on geographic products.
The US National Geospatial-Intelligence Agency or the UK Defence Geographic Centre. A user registers its requirement with either organisation to receive each new model as it is produced.
Yes. It requires one of five forms depending on the product: a Three-Norths diagram, isogonals, isogrivs, a compass rose, or the Magnetic Variation (MAGVAR) object, each carrying the date of the information and its annual rate of change.
Magnetic declination changes over time - the document calls this secular variation - so a model that is not periodically replaced goes out of date even though nothing else about the system has changed.
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