The NPOI is a collaborative effort of the U.S. Naval Observatory, the Naval Research Laboratory, and Lowell Observatory. It is located about 19 km southeast of Flagstaff, Arizona on Anderson Mesa. The array has three arms, 120 deg apart, with arms running north, southeast, and southwest. Siderostats, at fixed stations, direct light into the system. Although the siderostat flats are 0.5 m in diameter, the aperture is set at 0.12 m by the fast-steering mirrors that guide the light into the vacuum system. Some of the siderostats can be shifted from station to station and the stations which are populated by siderostats determines the baselines. While eventually the NPOI will have baselines as long as 437 m, currently, the longest baseline is 79 m and, in the case of the 2009 geosat observations, we used only a 15.9 m baseline oriented close to the east to west direction.1 Currently, the NPOI observes in 16 channels spanning 550 to 850 nm in wavelength. Data taken at the longer wavelengths samples source structure at lower resolution, while data taken at shorter wavelength samples source structure at higher resolution.