You can already create the electronic report when you are berthed. The report can then be sent as soon as internet is available again.
In addition, there is always a VHF channel available for traffic information in North Sea Port. The channels in question are 05, 06, 09 and 11. These are intended for use in the event of problems. You can also get specific port information there.
North Sea Port only asks you to submit the administrative voyage information by BICS (or another means) in advance.