Patent ID: 6922056

Claim:
A method for locating a horizontal bore below a ground surface, said method comprising: radiating a magnetic field from said bore using a transmitting source positioned therein; arranging a receiver remote from said transmitting source having a plurality of coils disposed so that each one of the coils occupies a predetermined operative position with respect to a horizontal plane when said receiver is disposed in a first position with respect to said horizontal plane and so that at least a first one of the coils moves into said operative position of a second one of said coils when said receiver is rotated to a second position with respect to said horizontal plane, said coils generating a plurality of signals induced on the coils by said magnetic field; providing a processor for using at least a first signal and a second signal produced by respective first and second ones of said coils induced on the coils by said magnetic field; and configuring a control circuit for selectively transferring the first and second signals to the processor by detecting one of the first position and the second position of the receiver arrangement and routing the second signal to the processor in place of the first signal when the receiver is in said second receiver position.