  We present a method to correct for deflections of ultra-high energy cosmic
rays in the galactic magnetic field. We perform these corrections by simulating
the expected arrival directions of protons using a parameterization of the
field derived from Faraday rotation and synchrotron emission measurements. To
evaluate the method we introduce a simulated astrophysical scenario and two
observables designed for testing cosmic ray deflections. We show that protons
can be identified by taking advantage of the galactic magnetic field pattern.
Consequently, cosmic ray deflection in the galactic field can be verified
experimentally. The method also enables searches for directional correlations
of cosmic rays with source candidates.
