Top: diagram showing the positions of sources across the FOV of our ODI images of AGC 501816, which includes the Galactic GC Pal 3. Gray points mark the locations of objects in the final stellar catalog (after cross-matching with the Gaia EDR3 and SDSS catalogs and removing contaminants). The ALFALFA H I source is shown with a solid green ellipse. Pal 3 is the cluster of point sources ∼7 arc minutes away from the H I centroid. The half-light radius and tidal radius of the GC from Baumgardt & Hilker (2018) are marked, along with the 3 r _h circle used to remove Pal 3 stars before we searched for stellar overdensities associated with the H I. Two detected overdensities are marked with cyan and purple circles. The stellar overdensities and the H I source are either inside or overlapping with the tidal radius of Pal 3. Bottom: the CMDs for the two stellar overdensities detected in the AGC 501816 field after all stars within 3 r _h of Pal 3's center were removed. Gray points are all sources inside a 3′ radius around the peak of the overdensity, and red points are sources within that radius that fall within the CMD filter at the given distance. For reference, we have overplotted an isochrone from Girardi et al. (2004; solid blue line) with the age and metallicity of Pal 3 (10 Gyr, [Fe/H] = −1.7 or Z = 0.0004; Hilker 2006), shifted to match the distance at which each overdensity is detected (80 kpc or 90 kpc).