Indoor location and asset tracking system with ZigBee technology Basic accuracy 2 meter RMS Long battery life Location achieved by having at least three static nodes ( ZigBee router devices) Taking advantage of regular ZigBee Regular network maintenance A mix of mobile and station devices providing mobile tracking and control at the same time High duty mobile node with long battery life Overlay service added on existing ZigBee telemetry network – no separated Zigbee network required for the tracking system. Sophisticated and advanced wireless tracking and location algorithm developed and implemented