Fig. 1 shows the Code-Carrier divergence standard deviation, averaged over the whole of 2008 on an azimuth–ele-
vation map. Larger values below elevation angle of 20° are
indicative of multipath activity in the region of azimuths
45°, 145° and 240° roughly corresponding to the NE, SSE and SW directions respectively.
Fig. 2 shows the L1 C/N standard deviation for the
whole of 2008 on an azimuth–elevation map, indicating significant signal quality degradation in the region of azimuth
about 170° and for elevation angles between 20° and 30°.