A professional who draws subsurface contours in rock formations from data obtained by geophysical prospecting party.

• Plots maps and diagrams from computations based on recordings of seismograph, gravity meter, magnetometer, and other petroleum prospecting instruments and from prospecting and surveying field notes.
• Performs other duties as described under drafter master title.
• May be designated according to method of prospecting as Drafter, Seismograph.