Harwich Haven Authority (HHA) has statutory powers to regulate commercial and leisure vessels within the HHA Area of Jurisdiction and is responsible for the navigational safety and traffic regulation of all vessels bound to and from the Haven Ports of Felixstowe, Harwich International, Harwich Navyard, Ipswich, and Mistley.

All vessels arriving at or sailing from the Haven Ports, or on passage through the Harwich Seaward Area, must report to Harwich Vessel Traffic Service (VTS) and comply with VTS Rules. The Reporting Procedures and VTS Rules are set in the General directions for Navigation and published in the Admiralty List of Radio Signals.