Performance measurements on the propeller shaft are performed during measured miles, acceptance of new ships and, in case of problems, in the area of propeller/engine tuning to determine the power consumption of the propeller at full-scale. For this, the torque and speed of the propeller shaft or gear coupling shafts and intermediate shafts are measured. The torque measurement is carried out with strain gauges and the speed measurement with a magnet-hall sensor system. With a Bluetooth measurement module, the signals are processed and transmitted digitally to a measuring computer. Additional metrics like speed, heading, rudder angle and trim of the vessel may be time equidistantly recorded. For this purpose, GPS / DGPS systems, gyroscopes and other instrumentation are available.