Method for determining the average distance (v) of a measuring device from a conductor, wherein the measuring device comprises a measuring system, wherein an electrical current flows through the conductor so that a magnetic field having a magnetic flux density (B) is formed, the magnetic flux density (B) having a horizontal component (B H) and a vertical component (B V), having the steps: - determining a profile of the horizontal component (B H) against the horizontal position (h[m]) of the measuring device, wherein the horizontal position (h[m]) indicates the orthogonal distance of the measuring device from the longitudinal axis of the conductor parallel to the Earth's surface, wherein the profile of the horizontal component (B H) is determined by measuring the horizontal components (B H) at at least two different horizontal positions (h[m]) using the measuring system of the measuring device, which changes the horizontal position (h[m]), and - determining a profile, associated with the profile that has been determined of the horizontal component (B H), of the vertical component (B V) against the horizontal position (h[m]) of the measuring device, wherein the profile of the vertical component (B V) is determined by measuring the vertical components (B V), associated with the horizontal components (B H) that have been determined, using the measuring system, - determining the ratio of the profile of the vertical component (B V) to the profile of the horizontal component (B H) as a function of the horizontal position (h[m]) of the measuring device, - determining the derivative of the ratio with respect to the horizontal position, - determining the inverse of the derivative, and - determining the average distance (v) of the measuring devices from the conductor from the inverse of the derivative. wherein the measuring device comprises a measuring system, wherein an electrical current flows through the conductor so that a magnetic field having a magnetic flux density (B) is formed, the magnetic flux density (B) having a horizontal component (B H) and a vertical component (B V), having the steps: - determining a profile of the horizontal component (B H) against the horizontal position (h[m]) of the measuring device, wherein the horizontal position (h[m]) indicates the orthogonal distance of the measuring device from the longitudinal axis of the conductor parallel to the Earth's surface, wherein the profile of the horizontal component (B H) is determined by measuring the horizontal components (B H) at at least two different horizontal positions (h[m]) using the measuring system of the measuring device, which changes the horizontal position (h[m]), and - determining a profile, associated with the profile that has been determined of the horizontal component (B H), of the vertical component (B V) against the horizontal position (h[m]) of the measuring device, wherein the profile of the vertical component (B V) is determined by measuring the vertical components (B V), associated with the horizontal components (B H) that have been determined, using the measuring system, - determining the ratio of the profile of the vertical component (B V) to the profile of the horizontal component (B H) as a function of the horizontal position (h[m]) of the measuring device, - determining the derivative of the ratio with respect to the horizontal position, - determining the inverse of the derivative, and - determining the average distance (v) of the measuring devices from the conductor from the inverse of the derivative. - determining a profile of the horizontal component (B H) against the horizontal position (h[m]) of the measuring device, wherein the horizontal position (h[m]) indicates the orthogonal distance of the measuring device from the longitudinal axis of the conductor parallel to the Earth's surface, wherein the profile of the horizontal component (B H) is determined by measuring the horizontal components (B H) at at least two different horizontal positions (h[m]) using the measuring system of the measuring device, which changes the horizontal position (h[m]), and wherein the horizontal position (h[m]) indicates the orthogonal distance of the measuring device from the longitudinal axis of the conductor parallel to the Earth's surface, wherein the profile of the horizontal component (B H) is determined by measuring the horizontal components (B H) at at least two different horizontal positions (h[m]) using the measuring system of the measuring device, which changes the horizontal position (h[m]), and - determining a profile, associated with the profile that has been determined of the horizontal component (B H), of the vertical component (B V) against the horizontal position (h[m]) of the measuring device, wherein the profile of the vertical component (B V) is determined by measuring the vertical components (B V), associated with the horizontal components (B H) that have been determined, using the measuring system, - determining the ratio of the profile of the vertical component (B V) to the profile of the horizontal component (B H) as a function of the horizontal position (h[m]) of the measuring device, - determining the derivative of the ratio with respect to the horizontal position, - determining the inverse of the derivative, and - determining the average distance (v) of the measuring devices from the conductor from the inverse of the derivative.