What is the accuracy range for military grade GPS devices?

Military-grade GPS devices, also known as Precise Positioning Service (PPS), are designed to provide a higher level of accuracy than standard civilian GPS devices. The accuracy for military-grade GPS can be as precise as 1 millimeter under optimal conditions, primarily due to enhanced signals and encryption methods that reduce errors from various sources like atmospheric disturbances and multipath effects. Typically, these devices can maintain an accuracy level of up to 1 meter in more general circumstances.

The capability to achieve such high precision is crucial for applications in military operations where accurate positioning can significantly impact strategy and effectiveness. In contrast, civilian-grade GPS systems generally have greater inaccuracies due to signal limitations and intentional degradation and typically range from a few meters to several meters, but they do not reach the precision levels offered by military systems.