A medical device locating system for determining a disposition of a sensor coil in a subject, the system comprising: an array of three or more quadruplet drive coil sets , each quadruplet drive coil set including at least four discrete drive coils, each of the discrete drive coils being electromagnetic coils, wherein at least two of the discrete drive coils in each quadruplet drive coil set are arranged perpendicularly relative to each other in one or more of an x-y, x-z, or y-z array, and at least two of the discrete drive coils in the same quadruplet drive coil set are arranged perpendicularly relative to each other and geometrically oriented off axis at both a negative 45 degree angle and positive 45 degree angle away from the respective x, y, or z axis; at least one moveable sensor coil configured to provide one or more sensor coil response signals; a first system component providing AC drive signals to energize the discrete drive coils, wherein the first system component is configured to provide the AC drive signals by: simultaneously driving two or more of the discrete drive coils within each quadruplet drive coil set to generate an electromagnetic field defining a virtual axis; or selectively providing phase inversion of the drive signal to any one or more of the discrete drive coils within each quadruplet drive coil set , or; simultaneously driving two or more of the discrete drive coils within each quadruplet drive coil set with two or more drive signals with inverted phase; a second system component for receiving the one or more sensor coil response signals from the at least one moveable sensor coil ; and a processor configured to determine a sensor coil disposition of the at least one moveable sensor coil in the subject relative to the quadruplet drive coil sets based on the one or more sensor coil response signals. an array of three or more quadruplet drive coil sets , each quadruplet drive coil set including at least four discrete drive coils, each of the discrete drive coils being electromagnetic coils, wherein at least two of the discrete drive coils in each quadruplet drive coil set are arranged perpendicularly relative to each other in one or more of an x-y, x-z, or y-z array, and at least two of the discrete drive coils in the same quadruplet drive coil set are arranged perpendicularly relative to each other and geometrically oriented off axis at both a negative 45 degree angle and positive 45 degree angle away from the respective x, y, or z axis; at least one moveable sensor coil configured to provide one or more sensor coil response signals; a first system component providing AC drive signals to energize the discrete drive coils, wherein the first system component is configured to provide the AC drive signals by: simultaneously driving two or more of the discrete drive coils within each quadruplet drive coil set to generate an electromagnetic field defining a virtual axis; or selectively providing phase inversion of the drive signal to any one or more of the discrete drive coils within each quadruplet drive coil set , or; simultaneously driving two or more of the discrete drive coils within each quadruplet drive coil set to generate an electromagnetic field defining a virtual axis; or selectively providing phase inversion of the drive signal to any one or more of the discrete drive coils within each quadruplet drive coil set , or; simultaneously driving two or more of the discrete drive coils within each quadruplet drive coil set with two or more drive signals with inverted phase; a second system component for receiving the one or more sensor coil response signals from the at least one moveable sensor coil ; and a processor configured to determine a sensor coil disposition of the at least one moveable sensor coil in the subject relative to the quadruplet drive coil sets based on the one or more sensor coil response signals. <EOS>