Nighthawk M1 public login - data offloading

I received my Mobile Router today.  I have been able to data offload using ehternet and my Comcast Business Class internet connection with ease.  I will be traveling internationally next week and wonder if anyone has any experience trying to use a wired ethernet connection on a cruise ship.  The goal is to share the ships internet with my devices while the ship is at sea and use my international data sim while in port.  Like hotels, you must log in thru a ship logon screen to register the device.  Any thoughts about making this work would be greatly appreciated.  Most of the ships cabins have wifi as well as wired ethernet.