On the Oostende meeting of EAEG in 1986, a simple depth inversion of transient (time-domain EM) soundings was suggested by the author for the CIL (coincident loop) layout. This procecure (called TRH, because the transformation goes from the time to depth via resistivity) has been proved serviceable for preliminary interpretation of sounding curves, and combined with master curves and/or interactive curve fitting, the results seem to be stables and geologically acceptable.