Registration (or alignment) of the synthetic imagery with the real world is crucial in augmented reality (AR) systems. The data from user-input devices, tracking devices, and imaging devices need to be registered spatially and temporally with the user's view of the surroundings. Each device has an associated delay between its observations of the world and the moment when the AR display presented to the user appears to be affected by a change in the data. We call the differences in delay the relative latencies. Relative latency is a source of misregistration and should be reduced. We give general methods for handling multiple data streams with different latency values associated with them in a working AR system. We measure the latency differences (part of the system dependent set of calibrations), time-stamp on-host, adjust the moment of sampling, and interpolate or extrapolate data streams. By using these schemes, a more accurate and consistent view is computed and presented to the user.