A precision geodetic measurement system (Aries for Astronomical Radio Interfereometric Earth Surveying) based on the technique of very long base line interferometry has been designed and implemented through the use of a 9-m transportable antenna and the NASA 64-m antenna of the Deep Space Communications Complex at Goldstone. A series of experiments designed to demonstrate the inherent accuracy of a transportable interferometer was performed on a 307-m base during the period from December 1973 to June 1974. This short base line was chosen in order to obtain a comparison with a conventional survey with a few-centimeter accuracy and to minimize Aries errors due to transmission media effects, source locations, and earth orientation parameters. The base line vector derived from a weighted average of the measurements, representing approximately 24 h of data, possessed a formal uncertainty of about 3 cm in all components. This average interferometry base line vector was in good agreement with the conventional survey vector within the statistical range allowed by the combined uncertainties (3--4cm) of the two techniques.