Tzia is the best destination for sailors and yachts. The commercial harbor, Korissia, in the bay of Agios Nikolaos has private boats, but the main anchor for them is Vourkari, on the NE side of Agios Nikolaos Bay.
Other anchorages: Koundouros is well protected from meltemia although open to the south. You can tie in NEs and its bottom has good grip. Poisses, in the north of Koundouros, are also protected by the meltemia and they design a sandy bottom. Karthaia (Poles) is open to the SE winds. In the middle of the bay there is an island connected to the coast. Spathi is in NE of Kea and offers a good protection from the meltemia. Its sea bottom reaches 5 m. Otzias is in the north and is therefore ideal only when no strong winds blow.