The above procedure is continued fo

The above procedure is continued for every frequency, so at the end of the algorithm the functions ∆0(ω) and ∆1(ω) have been calculated. The directional wave spectrum D(ω, θ ) is calculated from Eq. (3).WaveAna reads the measured values from a text file which contains the vertical, North–South and East–West displacements of the buoy in three columns. The user, through the Setup procedure, gives the file name which contains the measurements, the sampling period in seconds, the number of samples (rows) for a full measurement interval, the averaging length for smoothing the measurements and the depth at the point of measurement.All data have been obtained from the POSEIDON system [3]. The analysis showed that there are cases where local wind generated waves can be easily separated from propagating ones.