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The requirement of electroweak naturalness in simple supersymmetric models motivates the existence of a cluster of four light higgsinos with mass 100-300 GeV. While such light compressed spectra may be challenging to observe at the LHC, future ee colliders with p s > 2mhiggsino would serve as both a SUSY discovery machine and a precision microscope. We study higgsino pair production signatures at the ILC based on full, Geant4-based simulation of the ILD concept. We examine several benchmark scenarios that may or may not be accessible to the HL-LHC searches, with mass differences between the higgsino states between 20 and 4 GeV. Assuming p s= 500 GeV and 1000 fb 1 of integrated luminosity, the individual higgsino masses can be measured to 1-2% precision in case of the larger mass differences, and still at the level of 5% for the smallest mass difference case. The higgsino mass splittings are sensitive to the electroweak gaugino masses and can allow extraction of gaugino masses to ⇠ 3-20% (depending on the model). Extrapolation of gaugino masses via renormalization group running can test the hypothesis of gaugino mass unification. We also examine a case with natural generalized mirage mediation where the unification of gaugino masses at an intermediate scale apparently gives rise to a natural SUSY spectrum somewhat beyond the reach of the HL-LHC. Presentation at XXIX International Symposium on Lepton Photon Interactions at High Energies LeptonPhoton2019, August 5-10, 2019, Toronto, Canada This work was carried out in the framework of the ILD concept group. P o S ( L e p t o n P h o t o n 2 0 1 9 ) 1 2 9 The ILC as a natural SUSY discovery machine and precision microscope: From light higgsinos to tests of unification