The large area coordinate detector (DECOR) represents a multilayer system o
f plastic streamer tube chamber modules surrounding the Cherenkov water cal
orimeter NEVOD. Experimental data collected during the test expositions of
first DECOR supermodules (8 vertical planes with 8.4 m(2) working area) hav
e been analysed, angular and spatial reconstruction accuracies have been es
timated. The procedure of the selection of events corresponding to detectio
n of parallel tracks (muon bundles originated in the atmosphere) is discuss
ed.