  We study the transition from a many-body localized phase to an ergodic phase
in spin chain with correlated random magnetic fields. Using multiple
statistical measures like gap statistics and extremal entanglement spectrum
distributions, we find the phase diagram in the disorder-correlation plane,
where the transition happens at progressively larger values of the correlation
with increasing values of disorder. We then show that one can use the average
of sample variance of magnetic fields as a single parameter which encodes the
effects of the correlated disorder. The distributions and averages of various
statistics collapse into a single curve as a function of this parameter. This
also allows us to analytically calculate the phase diagram in the
disorder-correlation plane.
