  We exploited the large areal coverage offered by the DPOSS to analyze the
outermost regions of the galactic globular cluster M 92. Two independent
photometric reduction programs (SKICAT and DAOPHOT) were used to construct a
color-magnitude diagram and a surface density profile for this cluster, based
on J- and F-band DPOSS plates. A strong similarity has been found in the
performance of the two programs in the low--crowded outermost cluster regions.
After removing the background contribution, we obtained the cluster outer
surface density profile down to a surface brightness magnitude of mu_V ~ 31
mag/sq.arcsec and matched it with the inner profile of Trager et al. 1995. The
profile shapes match very well: since our data are uncalibrated, the shift in
magnitude between the profiles has been also used to calibrate our profile. The
analysis shows that the cluster has an extra tidal halo extending out to ~ 30
arcmin from the cluster center at a 3 sigma level over the background noise.
This halo is revealed to be almost circular.
