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We report on a new experimental method based on initial-state radiation (ISR)in e-p scattering, in which the radiative tail of the elastic e-p peak containsinformation on the proton charge form factor ($G_E^p$) at extremely small$Q^2$. The ISR technique was validated in a dedicated experiment using thespectrometers of the A1-Collaboration at the Mainz Microtron (MAMI). Thisprovided first measurements of $G_E^p$ for $0.001\leq Q^2\leq 0.004 (GeV/c)^2$.

First measurement of proton's charge form factor at very low $Q^2$ with initial state radiation