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The detection of astrophysical Gamma-Ray Bursts (GRBs) has always beenintertwined with the challenge of identifying the direction of the source.Accurate angular localization of better than a degree has been achieved to dateonly with heavy instruments on large satellites, and a limited field of view.The recent discovery of the association of GRBs with neutron star mergers givesnew motivation for observing the entire $\gamma$-ray sky at once with highsensitivity and accurate directional capability. We present a novel$\gamma$-ray detector concept, which utilizes the mutual occultation betweenmany small scintillators to reconstruct the GRB direction. We built aninstrument with 90 (9\,mm)$^3$ \csi~scintillator cubes attached to siliconphotomultipliers. Our laboratory prototype tested with a 60\,keV sourcedemonstrates an angular accuracy of a few degrees for $\sim$25 ph\,cm$^{-2}$bursts. Simulations of realistic GRBs and background show that the achievableangular localization accuracy with a similar instrument occupying $1$l volumeis $<2^\circ$. The proposed concept can be easily scaled to fit into smallsatellites, as well as large missions.

GALI: a Gamma-ray Burst Localizing Instrument