A marker configured to be buried adjacent an underground structure such that a location of the underground structure can be identified from above a ground surface, said marker comprising: a housing ; a gimbal beacon retention device pivotally disposed within the housing : an inductance-capacitance LC, beacon device carried by the gimbal beacon retention device , wherein the LC beacon device comprises an inductor coil and a capacitor operably connected with the inductor coil , characterized in that the gimbal beacon retention device comprises: an outer gimbal structure pivotally disposed within the housing ; and an inner gimbal structure pivotally disposed within the outer gimbal structure , the inner gimbal structure comprising: a chassis that defines a coil bobbin having an exterior surface around which the inductor coil is wound; and a pair of opposing pivot pins extending from chassis that pivotally connect the inner gimbal structure to the outer gimbal structure , wherein the gimbal beacon retention device is structured to orient the coil bobbin of the inner gimbal structure and the inductor coil disposed therearound such that a signal emitted by the LC beacon device will be emitted in a direction substantially opposite the direction of the force of gravity regardless of the orientation of the housing . a housing ; a gimbal beacon retention device pivotally disposed within the housing : an inductance-capacitance LC, beacon device carried by the gimbal beacon retention device , wherein the LC beacon device comprises an inductor coil and a capacitor operably connected with the inductor coil , characterized in that the gimbal beacon retention device comprises: an outer gimbal structure pivotally disposed within the housing ; and an inner gimbal structure pivotally disposed within the outer gimbal structure , the inner gimbal structure comprising: a chassis that defines a coil bobbin having an exterior surface around which the inductor coil is wound; and a pair of opposing pivot pins extending from chassis that pivotally connect the inner gimbal structure to the outer gimbal structure , wherein the gimbal beacon retention device is structured to orient the coil bobbin of the inner gimbal structure and the inductor coil disposed therearound such that a signal emitted by the LC beacon device will be emitted in a direction substantially opposite the direction of the force of gravity regardless of the orientation of the housing . an outer gimbal structure pivotally disposed within the housing ; and an inner gimbal structure pivotally disposed within the outer gimbal structure , the inner gimbal structure comprising: a chassis that defines a coil bobbin having an exterior surface around which the inductor coil is wound; and a pair of opposing pivot pins extending from chassis that pivotally connect the inner gimbal structure to the outer gimbal structure , a chassis that defines a coil bobbin having an exterior surface around which the inductor coil is wound; and a pair of opposing pivot pins extending from chassis that pivotally connect the inner gimbal structure to the outer gimbal structure , wherein the gimbal beacon retention device is structured to orient the coil bobbin of the inner gimbal structure and the inductor coil disposed therearound such that a signal emitted by the LC beacon device will be emitted in a direction substantially opposite the direction of the force of gravity regardless of the orientation of the housing . <EOS>