Abstract: In one embodiment, an apparatus for generating attitude data corresponding to B-scan imaging data generated by an ultrasound probe. The apparatus includes one or more magnetic field sensors generating, based on measurements of the earth's magnetic field, magnetic field data for the probe, which is used to determine the orientation of the probe in a plane. The apparatus preferably also includes one or more accelerometers for determining tilt orientation and position. The apparatus further includes an interface providing, based on the magnetic field data, output data corresponding to the imaging data. The apparatus can be integrated into a probe or can be an attachment to retrofit an existing probe.