The Pathfinder advanced intrusion detection system is the next generation of Expendable Unattended Ground Sensor (E-UGS) system. Pathfinder incorporates lessons learned by the US Military and is specifically optimized for Defense, Border Security, Critical Infrastructure, and Consumer applications. The Pathfinder system provides an early warning detection system alerting operators to potential threats. The Pathfinder system is s seismic detection system which integrates state of the art machine learning algorithms to detect human footsteps and off-road vehicles. The algorithm has been trained to detect on human footsteps, ignoring animal footsteps, and other seismic background noises.