A location determination system (100) utilizes a low accuracy timing infrastructure (106) to synchronize a personal tracking device (120) having high accuracy timing location determination devices integrated therein. The PTD (120) includes a radio frequency (RF) location unit (102) and integrated sensors, such as altimeter (132), GPS receiver (134) and inertial navigation unit (IMU) (136). The RF location unit (102) receives a synchronization command from the low accuracy timing infrastructure (106) and provides timing data representing range information in response thereto. The range information is used by the high accuracy timing infrastructure (180) to compute updated X, Y, Z coordinates of the PTD (120).