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On the seabed, the sensing performances of 3C MEMS remain unrivalled. In addition to the true phase an amplitude sensing capability of 1C MEMS, signal can be reconstructed with a true verticality, while the vector fidelity of the 3C axis is significantly improved. This added to other properties of MEMS, makes this sensor a probable driver for the development of OBN acquisitions - especially for sparse, blended or 4D acquisitions, where the sensing fidelity more than ever matters.