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Extreme Energy Cosmic Rays, EECRs -- cosmic rays with energies beyond the GZKcutoff (i.e. greater than 100 EeV) are scarce. Only a few of such events havebeen detected by air shower experiments and the nature of the primary particlesare still unknown. Individual EECRs sources become more prominent, relative tothe background, as the horizon diminishes. We show that an event-by-event,composition-dependent observatory would allow us to limit the character of thesources and learn about the intervening magnetic fields, as the deflections inthe intervening Galactic and extragalactic magnetic fields depend on the natureof the particle. A major goal here is to provide a methodology to distinguishbetween steady and transient sources.

Extreme Energy Cosmic Rays "Treasure Maps": a new methodology to unveil the nature of cosmic accelerators