Stena line ferry.
SSID: Internet@Sea
Free access (advertised as Messaging and required regular re-connects every 10 minutes or so possibly due to using data at a rate that would indicate more than messages):
Download: 1.02 MBPS
Upload: 1.08 MBPS
Ping: 21 MS
Paid WiFi (€5.60 for the whole journey and stayed connected throughout the journey, advertised as able to stream videos and make video calls):
Download: 5.22 MBPS
Upload: 4.74 MBPS
ISP's: The ISP started as ADDIX GmbH, then as the journey progressed changed to GlobalConnect A/S then Bahnhof AB and once we arrived at the destination to Stena Rederi AB (Stena Line's own ASN by the looks of it). I wonder if any of you can guess the route from these ISP's.
The connection was advertised as a Radiolink connection and I doubt it was Starlink due to the different ISP's along the route.