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We consider magnetotransport in high-mobility 2D electron gas in anon-quantizing magnetic field. We employ a weakly chiral network model to testnumerically the prediction of the scaling theory that the transition from anAnderson to a quantum Hall insulator takes place when the Drude value of thenon-diagonal conductivity is equal to 1/2. The weaker is the magnetic field theharder it is to locate a delocalization transition using quantum simulations.The main idea of the present study is that the position of the transition doesnot change when a strong local inhomogeneity is introduced. Since the stronginhomogeneity suppresses interference, transport reduces to classicalpercolation. We show that the corresponding percolation problem is bondpercolation over two sublattices coupled to each other by random bonds.Simulation of this percolation allows to access the domain of very weakmagnetic fields. Simulation results confirm the criterion \sigma_{xy}=1/2 forvalues \sigma_{xx}\sim 10, where they agree with earlier quantum simulationresults. However for larger \sigma_{xx} we find that the transition boundary isdescribed by \sigma_{xy} \sigma_{xx}^k with k= 0.5, i.e., the transition takesplace at higher magnetic fields. The strong inhomogeneity limit ofmagnetotransport in the presence of a random magnetic field, pertinent tocomposite fermions, corresponds to a different percolation problem. In thislimit we find for the delocalization transition boundary \sigma_{xy}\sigma_{xx}^{0.6}.

Phase diagram of weak-magnetic-field quantum Hall transition quantified from classical percolation