A submarine detection buoy comprises a float 1 supporting an antenna 2 connected to emission and supply means 3, which are connected by way of an assembly 5 for mechanical stabilisation relative to the water and current supply to a non-magnetic case 11 containing means for processing, multiplexing data to the emission means and measuring orientation of the case in the water. The case is connected to a detector unit 10 which is in turn connected mechanically to a ballast means 9. The detector unit comprises an omnidirectional magnetic resonance probe, the means for measuring the orientation of the case comprising means for measuring the three components of the terrestrial magnetic field with respect to the case, and rigid connecting means being provided between the case and the detector unit.
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