Geodetic systems capable of accurate, global measurements have been in use since the early 1970s. These systems, Satellite Laser Ranging (SLR) and Very Long Baseline Interferometry (VLBI) rapidly evolved from global-meter level systems to tens of centimeters in the late 1970s to centimeter-level systems by the late 1980s. Their evolution was also accompanied by the development of other geodetic systems in the 1980s and 1990s such as the Global Positioning System (GPS), the Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS), and the Precise Range and Range-rate Experiment (PRARE). With now over 20 years of accurate geodetic available, and motivated by recent developments in the geophysical modeling of the Earth, it is possible to start examining the geodetic records for deviations from secular motions and to assess if these variations are reflections of the complexity of Earth dynamics or errors in the geodetic systems themselves. We will examine results from VLBI, GPS, and DORIS to address the issue of non-secular variations in the positions of near-by sites. These systems are chosen because results are available in the Solution Independent Exchange (SINEX) format that allows analyses to be performed with minimal apriori constraints on the motions to be expected.