Helmy · Yacht Management
Marina in Senj, Croatia
Obala kralja Zvonimira 12, 53270 Senj
Main harbour master's office for the Senj district under the Ministry of the Sea. Yachts in this district handle vessel and port formalities here.
Other
https://mmpi.gov.hr/sea/harbormasters-offices/8461
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.