Patent ID: 8742747

Claim:
A locator for determining the location and/or orientation of a concealed conductor, comprising: a reference field detector that detects an alternating magnetic field along a reference axis; a first field detector orthogonal to the reference field detector and that detects an alternating magnetic field along a first axis; a second field detector parallel to the first field detector and orthogonal to the reference field detector, that detects an alternating magnetic field along the first axis; and a processor programmed to calculate an in-phase component of a signal detected by the first and second field detectors, wherein the in-phase component is in-phase with a signal detected at the reference field detector, and to calculate and output an indication of a position and/or orientation of the concealed conductor relative to the locator using at least the in-phase component of the signal detected by the first and second field detectors, wherein the first and second field detectors are configured to minimize interference from sources other than the concealed conductor.