Shipowners face a choice between northern and southern routes through the Strait of Hormuz, each with different rules and risks, as vessel traffic resumes under the US-Iran ceasefire, reported the UK's Seatrade Maritime News.

Iran's Persian Gulf Strait Authority announced on 19 June that vessels must apply for permits to use the northern route south of Larak Island, with a 48-hour waiting period. The authority stated that alternative routes are prohibited and no vessel may pass without a valid permit.

On 20 June, the Joint Maritime Information Centre issued guidance for the southern route in Omani waters, allowing transit at any time. Mariners were advised to keep AIS on, radars radiating, lights running, and to maintain normal use of VHF. Coordination with US naval guidance was encouraged but not mandatory.

Commercial shipping was warned of mines in the southern corridor and advised to expect naval mine clearance operations. Authorities also cautioned of congestion and possible hailing from naval forces to support traffic flow.

The split system leaves shipowners with a confusing picture as transits rise following the ceasefire. AIS data showed vessels including Indian-flagged VLCCs Desh Vibhor and Desh Viabhor, and Chinese bulker Hai Tun Zhou, using the Iranian northern route late 19 June and early 20 June.