Fourier domain first and second vertical derivatives of gravity and magnetics images may now be calculated from within Noddy by selecting Vertical Derivatives->First or Vertical Derivatives->Second from the Geophysics menu. These two options both read in a .mag or .grv file from disk, perform the vertical derivative calculation, and then save the result back to file (again as .mag or .grv format files). The results of this calculation are also displayed in a normal geophysics image window on completion of the calculation.