  We discuss the interpretation of the angles in the Geodesic Light-Cone (GLC)
coordinates. In particular, we clarify the way in which these angles can be
identified with the observed ones. We show that, although this identification
is always possible in principle, one cannot implement it in the usual
gauge-fixing way, i.e. through a set of conditions on the GLC metric. Rather,
one needs to invoke a tetrad at the observer and a Cartesian-like coordinate
system in order to obtain the desired map globally on the observed sky.
