In method of correcting for drift in a Global Navigation Satellite System (GNSS) receiver, a broadcast orbit in use at the GNSS receiver is nudged based on a first message received from a GNSS base station. The nudging creates a first nudged broadcast orbit for a GNSS satellite, the first nudged broadcast orbit being more precise than the broadcast orbit. A second message is received from the GNSS base station. Information included in the second message is employed to determine a drift rate of the first nudged broadcast orbit relative to a more precise orbit in use at the GNSS base station. Based upon the second message, the broadcast orbit is nudged to create a second nudged broadcast orbit for the GNSS satellite. A component of the drift rate is corrected for, relative to the second nudged broadcast orbit.