Sky distributions in Galactic coordinates (l, b) of previously known UCDs (panel a) and new UCDs (panel b) in the Gaia DR2 20 pc sample. The map is centred on l = 0°, b = 0°, with l rising to the left, and the Galactic north pole b = 90° at the top. The coloured filled and open symbols are as used in Fig. 3 for the subsamples A, B, C, and D, corresponding to different astrometric and photometric quality. Overplotted open squares in panel a mark all 263 known UCDs (including 14 without BP − RP colour belonging to subsample E, hence no coloured symbols). Overplotted pluses (identified in SIMBAD) and crosses (not found in SIMBAD) in panel b mark all 50 new UCDs (including 6 of subsample E). The new UCD labelled in panel b is a close companion of a previously known HPM star resolved by Gaia (see text).