During phase 1 a miner tracking system was developed that incorporated the use of RFID and inertial tracking. Measuring just 2.6 inches x 1.73 inches x .275 inches, Compulab's CM-X270L single-board computer was used as the development platform. The CM-X270L uses a Debian Linux operating system that runs the code for the filtering of the inertial tracking system, processing the required different data and the coordinate transformations. The inertial navigation system utilized a MicroStrain 3DM-GX1 inertial navigation sensor containing triaxial accelerometers, magnetometers, and angular rate sensors to measure static and dynamic orientation. Provided by the US Army's Communications-Electronics Research, Development, and Engineering Center (CERDEC) (Ft Monmouth, NJ) the filtering software and the inertial tracker system were developed according to the principle that when a step is taken, the end "shock" of the foot coming down onto the ground triggers the calculations of distance travelled during that step. The RFID reader used in this development, the Skyetek's SkyeModule M9, is a tiny ETS-compliant, embedded UHF RFID reader module. The M9 is an excellent solution for miner tracking and performed well in most aspects of testing. The M9 is highly recommended for this application. Significant testing of each individual component and of the system as a whole showed several design issues that must be considered for phase II and III. Some of the more significant issues included the effects of the miner's gear on the inertial tracking system and the polarization effect on RFID tags. Extreme Endeavors proposes the following characteristics for the miner tracking system: 1. Inertial Tracking system must be worn on the belt, back or helmet to reduce the effects of magnetic fields in the mine and to reduce the effects seen of mechanical abuse from being worn on the boot. 2. RFID reader and antenna to be embedded above the light. 3. System must automatically work without input or interface from the miner. 4. Computer system should interface and be updated through AUTOCAD drawings of the mine.