An apparatus for measuring the time delay between adjacent clock edges includes target and delay signal paths, a variable delay module in said delay signal path, the delay cell having a delay bias input, and a phase detector having respective inputs coupled to the target and delay signal paths. These units are united as independent units. A peer-to-peer client is loaded into the nodes to facilitate PTP file transfers to reduce loading on networks, network switches and file servers to reduce the time needed to load the nodes with these files to increase overall efficiency of the multi-node computing system. A computer and program means stores and accesses time indexed GPS position and GPS velocity data and transforms x, y and z axis acceleration data from body to navigation coordinates. An output signal of the bistable multivibrator is coupled to frequency measuring means to compare the repetition frequency thereof with a reference frequency.