The mooring fee varies from marina to marina. It also depends on the size of the boat. The mooring fee for catamaran is usually charged double than the mooring fee for the monohull of the same size. The average price is around 50-70 EUR for the boat cca. 43 ft per day. If you have already setteled your sailing route you can check the prices on the web sites of marinas on your route. On the other hand, some of the harbours and most of the anchorages are free. More information about marinas in Croatia.