Abstract: A field marker for easily and compactly folding to and from an implement with relatively few moving components. The inventive device includes an inner arm pivotally attached to a bracket structure attachable to a side of an implement, an outer arm pivotally attached to the inner arm, a marking disc journaled to a distal end of the outer arm, a first hydraulic cylinder attached between the bracket structure and the inner arm, a second hydraulic cylinder attached between the inner arm and the outer arm, and wherein the first and second hydraulic cylinders are fluidly connected in series so as to simultaneously extend and simultaneously retract the inner and outer arms. The inner arm is preferably rotatable about a substantially horizontal plane and the outer arm is preferably rotatable about a substantially vertical plane. The first hydraulic cylinder is larger than the second hydraulic cylinder to compensate for displaced hydraulic fluid by the shaft of the first hydraulic cylinder.