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We present for the first time a new concept for low-cost fabrication of a monolithic 3-axis MEMS compass using integrated permanent magnets and based on a technology compatible with inertial MEMS sensors. Piezoresistive gauges of nanometric scale enable to reduce the sensor size without sensitivity loss. Magnetometers were designed for sensitivities of 9V/T and resolutions less than 10nT/√Hz at a bridge current of 100μA and with an active surface of typically 200μm × 300μm. Ultra-low power consumption below 10μW can be achieved. First demonstrators have shown the good reliability of the concept and are in good agreement with design.