What is the military's grid system known as?

The military's grid system is known as the Universal Transverse Mercator Grid System, which is a map projection that divides the world into multiple zones in order to provide accurate geographic coordinates. This system uses a two-dimensional Cartesian coordinate system to represent the Earth's surface, allowing for precise mapping and navigation. Each zone is defined by a specific central meridian, which minimizes distortion and maximizes accuracy for mapping localized areas.

While the other options also relate to navigation and mapping, they serve different purposes. The Global Positioning System is a satellite-based navigation system that provides location and time information. The Military Grid Reference System is a method to express locations within the context of military operations using grid references. The Geographic Information System is a framework for capturing, managing, and analyzing spatial and geographic data, but it is not specifically a grid system like the Universal Transverse Mercator.