An apparatus for use in maintaining a desired orientation of an implement for forming holes, the apparatus comprising: orientation sensing equipment operable to sense the orientation of the implement, and an orientation indicator operable to be mounted to the implement or to a drive unit or a gearbox for the implement, the orientation indicator comprising a plurality of illumination devices extending substantially around the implement or extending substantially around the drive unit or gearbox for the implement, the orientation indicator having a plurality of indicating portions, and when the orientation indicator is mounted relative to the implement, the indicating portions are positioned so as to be visible from different locations around the implement, wherein the plurality of indicating portions include a first indicating portion and a second indicating portion located generally opposite to the first indicating portion, wherein that individual illumination devices in the array are arranged relative to one another to form a line of illumination devices defining a closed shape corresponding to and extending around a perimeter of the outer housing of an implement rotation drive unit, and the illumination devices forming the first portion of the array, and the illumination devices forming the second portion of the array are not fixed, and from time to time, depending on which direction the orientation of the implement has deviated, different ones of the illumination devices form part of either one or the other of the first and second portions of the array, wherein, in use, when the orientation of the implement deviates from a desired orientation, at least the first indicating portion and the second indicating portion illuminate to provide a visible indication of a direction in which the implement has deviated from the desired orientation, and wherein the first indicating portion illuminates in a first manner and the second indicating portion illuminates in a second manner when orientation of the implement deviates from the desired orientation. an orientation indicator operable to be mounted to the implement or to a drive unit or a gearbox for the implement, the orientation indicator comprising a plurality of illumination devices extending substantially around the implement or extending substantially around the drive unit or gearbox for the implement, the orientation indicator having a plurality of indicating portions, and when the orientation indicator is mounted relative to the implement, the indicating portions are positioned so as to be visible from different locations around the implement, wherein the plurality of indicating portions include a first indicating portion and a second indicating portion located generally opposite to the first indicating portion, wherein that individual illumination devices in the array are arranged relative to one another to form a line of illumination devices defining a closed shape corresponding to and extending around a perimeter of the outer housing of an implement rotation drive unit, and wherein the plurality of indicating portions include a first indicating portion and a second indicating portion located generally opposite to the first indicating portion, wherein that individual illumination devices in the array are arranged relative to one another to form a line of illumination devices defining a closed shape corresponding to and extending around a perimeter of the outer housing of an implement rotation drive unit, and the illumination devices forming the first portion of the array, and the illumination devices forming the second portion of the array are not fixed, and from time to time, depending on which direction the orientation of the implement has deviated, different ones of the illumination devices form part of either one or the other of the first and second portions of the array, wherein, in use, when the orientation of the implement deviates from a desired orientation, at least the first indicating portion and the second indicating portion illuminate to provide a visible indication of a direction in which the implement has deviated from the desired orientation, and wherein the first indicating portion illuminates in a first manner and the second indicating portion illuminates in a second manner when orientation of the implement deviates from the desired orientation.