Ferry lines
Ferries run between the following harbours: From Karaköy to Kadıköy and Haydarpasha Station; from Eminönü to Kadıköy, Haydarpasha, Üsküdar and Bostancı; from Beşiktaş to Kadıköy and Üsküdar and from Kabataş to Üsküdar and the Prince Islands. From the Asian Side: from Kadıköy to Eminönü, Karaköy, Beşiktaş and the Prince Islands; from Üsküdar to Eminönü, Beşiktaş and Kabataş; from Bostancı to Eminönü and the Prince Islands; Haydarpasha Station to Karaköy and Eminönü.

Furthermore, ferries make trips up and down the Bosphorus during the summer months, stopping at Anadolu Kavağı, Rumelihisarı, Sarıyer, Emirgân, Kanlıca, Anadoluhisarı, Bebek and Arnavutköy.

Sea buses
'Istanbul’s sea buses (ships that are smaller than the ferries, and sail more quickly) run between the following locations: From Eminönü to Kabataş, Kadıköy, and the Prince Islands; from Kabataş to Bostancı and the Prince Islands; from Karaköy to Bostancı, Pendik, and Kartal; from Kadıköy to Bakırköy, Eminönü and the Prince Islands; from Bostancı to Bakırköy, Yenikapı, Karaköy, Kabataş, Kadıköy and the Prince Islands. 

Sea buses are also an ideal way to reach resort destinations near Istanbul such as Yalova, Çınarcık, Avşa Island and Armutlu. These sea buses leave from Bostancı on the Asian Side and from Yenikapı on the European Side. They go to Avşa Island, Marmara Island, Yalova, Çınarcık, Mudanya, and Armutlu. There are also regular routes to Yalova from Kadıköy and Kartal, both on the Asian Side. Wireless Internet connection is also available in these routes.

Marinas
Kalamış Marina
The Setur Kalamış Marina is located in Kalamış - Fenerbahçe, one of the most charming neighborhoods in Istanbul. This marina has 1197 yacht capacity, and has a blue flag.

The marina includes a yacht store, number of shops, a parking garage with 375 vehicle capacity, and a variety of restaurants and bars. Should you need a barber, a laundry mat, a bank, or other such services, you can find them in the neighborhood just next to the marina.

Furthermore, yacht services such as docking, removing yachts from the water, returning them to the water, and cleaning are offered. Other services available include battery-charging, bilge-checking, ventilation, motor work, and every type of winter sheltering and periodic examinations. 

Ataköy Marina
The Ataköy Marina is located in Ataköy, just beside the Bakırköy Sea Buses.  The marina is eight kilometres from Sultanahmet Square, thirteen kilometres from Taksim Square, and four kilometres from Atatürk Airport. Ataköy Marina has the distinction of being the first five star marina in all of Turkey.

Among the many conveniences found in the marina are a laundry mad, showers, a clinic, a hotel, cafes and bars, an entertainment center, a night club, an internet cafe, a car park, yacht sale and rental offices, and a sports salon. A variety of fairs and racing events also take place on the marina. The marina houses 700 yachts on water and a 100 more on land, and is able to remove and return yachts of up to seventy tons to and from the water.

For more detailed information about travel, ticket prices, and routes:
Istanbul city ferries: www.ido.com.tr
Sea buses: www.ido.com.tr / Ph: (9)0212-444-4436
Kalamış Marina: www.seturmarinas.com/kalamis.html
Ph: (9)0216-346-2346 (6 lines) 
Ataköy Marina: www.atakoymarina.com.tr
Ph: (9)0212-560-4270 (20 lines)