Map of the surveyed area in the Hydra I cluster. The dashed squares mark the two pointings, which had been approved for observations in 2007 (Nrs. 1 and 2), but from which only pointing Nr. 1 was observed with one slit mask. Black dots are all compact sources observed in this particular programme (see Misgeld et al. 2008). The solid squares mark the two additional pointings for the new UCD survey in 2009 (Nrs. 3 and 4). The two pointings of the GC survey (see Sect. 2.2) are represented by the dotted squares (Nrs. 5 and 6). The large dotted circle indicates the projected cluster core-radius of r_c ~ 170   h^-1 kpc (Girardi et al. 1995), adopting h = 0.75. The large green asterisk marks the location of the central cluster galaxy NGC 3311.