Starting from the definition of the Goda spread parameter γ50 and from the verification of the spatial homogeneity hypothesis, the 50-year significant wave height H50 was obtained for a sea area characterized by a limited wave observation period. The procedure was applied for the location of Cetraro in the Southern Tyrrhenian Sea starting from the waves recorded offshore Ponza, provided that the spatial homogeneity hypothesis was verified. This hypothesis was not verified, however, between the wave measurement stations of Crotone or Catania and two wave measurement stations recently installed by Calabria Region in the Ionian Sea. In the Southern Tyrrhenian Sea the results of H50 were compared with the ones obtained with the method of fetch transposition of De Girolamo & Contini (1998).

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