WMM Materials. The materials for WMM are also important to understand in terms of specification. Aggregate: The aggregates for WMM typically consist of crushed stone, gravel, or other granular materials. These aggregates are mixed with water and a binder to create a wet mix, which is then compacted and laid as a base layer during road …
World Magnetic Model (WMM) The World Magnetic Model (WMM) is the standard model for navigation, attitude, and heading referencing systems using the geomagnetic field. Additional WMM uses include civilian applications, including navigation and heading systems. The model is a joint product of the United States' National Geospatial …