A palm-sized, wearable multi-constellation GNSS receiver with a built-in antenna, designed to be worn on an armband, helmet or safety vest for personnel tracking, security and GIS work. It tracks over 50 satellites across GPS, BeiDou, GLONASS, Galileo and QZSS, runs about 6 hours on its internal 3000mAh battery, and is IP67-rated with 4G and Bluetooth connectivity for centimeter-to-submeter positioning.