Helmy · Yacht Management
Marina in Istanbul, Turkiye
Kemankeş Mah. Rıhtım Cd. No:33, 34225 Karaköy/Beyoğlu/İstanbul
Harbour master office of the Turkish Ministry of Transport for the port of Istanbul, at Karakoy.
Other
https://www.uab.gov.tr/kurumsal/birimler/
Every yacht service in Istanbul
All marinas and harbours on Helmy
Helmy lists marinas port by port, free, with no account needed to look. It is also where a boat keeps her own papers, manuals, log book and orders.