© 2021 Institute of Measurement Science, Slovak Academy of Sciences.Two different inverse methods were applied to the two sets of well-defined data from tank experiments to assess the pacing electrode's position by the inverse solution. The use of a simple dipole as the equivalent heart generator provides only the assessment of the pacing site from the very early time interval of activation. The potential-based inverse solution aims to reconstruct the electrograms using the Bayesian estimation so that it needs prior knowledge about the properties of the cardiac sources. The accuracy of the pacing site localization was 8.6 and 18.4 mm for the dipole-based method and varied from 8.6 to 19.4 and from 8.6 to 32.5 mm for the potential-based method depending on the noise model and pacing site estimation method. The advantages of both inverse methods can be combined in the future to improve the inverse localization approaches.