Rx Networks GNSS assistance service Location.io has added StarCourse, an evolution in extended GNSS satellite ephemeris services. GNSS satellites transmit information about their location (current and predicted), velocity, clock information and health: the ephemeris data. Receivers use this data to estimate their location relative to the satellites and thus position on earth. This can give them the ability to achieve very fast initial position for portable digital devices including cell phones and a method to overcome lengthy initial position determination under poor signal conditions. It can also greatly reduce power consumption. This becomes especially important in devices that only turn on at set intervals or on demand.