Abstract: An apparatus and method for steering pipe casing laid underground is disclosed which includes a steerable pipe jacking head attached to a forward pipe casing and pushed through the ground by a string of pipe casings from a pipe pushing or jacking machine at a station below or above the ground. A steering wedge which may be rotated to a desired steering position and then extended from the forward end of the pipe jacking head is disclosed which accurately steers the pipe jacking head in horizontal and vertical directions. An inclinometer is used to measure the vertical position of the pipe jacking head. A directional heading sensor which includes a toroidal fluxgate magnetometer with a free floating ring core is utilized to measure the horizontal position of the pipe jacking head. Horizontal and vertical position signals, and the rotational position of the steering wedge, are measured and transmitted as serial data to a computer where the signals are processed and displayed graphically on a display screen.