Ephemerisle:Location/Europe

Europe has several seas with international waters which are sheltered from the big oceans. They have significantly smaller waves than off the U.S. coast and this may mean that Ephemerisle can venture into free waters quicker if arranged in Europe rather than in the U.S.

Possible seas include the Mediterranean Sea, the Baltic Sea etc.

Wave data for the Baltic Sea

This Google Maps layer indicate the positions of buoys collecting wave data publicly available from Finnish HELCOM (find it under "Indicator Fact Sheets" in the sidebar and then Wave climate).

One promising location seems to be near the Northern Baltic Proper buoy. It's close to three capital cities, Stockholm, Helsinki and Tallinn with a combined urban population of about 4 mio., and the wave height looks to stay below 3 meters in the summer months.

Another Google Maps layer indicate buoys in the Danish seas. Lasse Birk Olesen only have the data in a book, but none of the scales ever indicate waves higher than 6 meters and most of them never gets above 3-4 meters. This data is pretty old though, collected between 1930 and 1960, but where the buoys overlap with the HELCOM ones, they show to still have waves within the same range. If you want to use this data, contact Lasse and he can scan it in.