average weight on bit over a predefined unit of time computer instructions 620 625 can be usable with the rate of penetration monitoring and controlling section the data storage 28 can include computer instructions 620 to input a setpoint for rate of penetration of a bit forming an rop setpoint the data storage 28 can include computer instructions 621 to display sensed data from measurement while drilling equipment as actual values in feet per hour and percentage off of an input rop setpoint the data storage 28 can include computer instructions 622 to raise the rop setpoint with an up arrow the data storage 28 can include computer instructions 623 to lower the rop setpoint with a down arrow the data storage 28 can include computer instructions 624 to zero the rop setpoint with a zero rop setpoint button the data storage 28 can include computer instructions 625 to select input rate of penetration parameters as part of the auto drilling process when an auto drilling with rop limiter button is actuated computer instructions 650 658 can be usable with the differential pressure monitoring and controlling section the data storage 28 can include computer instructions 650 to input a setpoint for mud pump differential pressure displayed as a differential pressure setpoint the data storage 28 can include computer instructions 651 to display sensed data from measurement while drilling equipment as actual values in psi coming from drilling fluid pressure and percentage off from the differential pressure setpoint the data storage 28 can include computer instructions 652 to input a differential pressure setpoint.