TRX Systems develops precise, infrastructure-free location and tracking products that deliver real-time 3D location and status of personnel in environments without reliable GPS coverage. TRX products are the first to deliver the precision required to improve situational awareness and safety for first responders, dismounted soldiers, and security personnel (including those inspecting for radiation, chemical, and other threats), and to effectively support personnel training applications. TRX Navigation Engine software can easily be integrated with partner sensors, communication systems, and situation awareness systems that require GPS-denied location capabilities. TRX was created to take advantage of the emerging ubiquity of personal location technology and small electronics. We have a specific focus in providing advanced navigation software, low cost location-aware computing, wireless sensor networks, and related signal processing.