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.