You are standing on the deck of the ferry, the coastline slowly fading behind you, and you send one more photo to the people back home. A few weeks later there is a line on your phone bill that makes you wince. Roaming at sea is one of the most expensive ways to use the internet in existence, and most travelers have no idea why. Here is how it works, and what you should and above all should not do once the ship leaves port.
EU rules apply on land, not at sea
The "roam like at home" rules we have gotten used to in Europe apply to land-based networks. While the ship is still close to the coast, your phone often keeps its connection to the regular network of the country you are sailing past, and your bundle works as usual.
But once the ferry gets further from shore, that coverage drops away. And then something happens that most travelers are unaware of: many ferries carry their own network on board, connected via satellite. Your phone sees it as a normal mobile network and switches over automatically. Often the only clue is an unfamiliar network name appearing in your status bar.
Why satellite networks cost so much
These maritime satellite networks fall explicitly outside the European price caps. The EU rules do not protect you there, and the rates reflect that: you pay per MB, and the amounts are extreme. For perspective: on such a network, a handful of incoming messages, one mail sync and a single photo upload can cost more than an entire eSIM bundle for your whole holiday.
The nasty part is that you do not have to do anything for this to happen. Your phone switches over by itself, apps sync in the background by themselves, and the meter runs while you are having dinner in the onboard restaurant.
Which routes does this affect?
Anywhere you are away from the coast for more than an hour or so:
- Ferries to the United Kingdom and Ireland, such as the crossings from the Netherlands, Belgium and France, and the routes across the Irish Sea.
- Scandinavian routes, for example between Germany, Denmark, Sweden and Norway, where crossings often take a whole night.
- Mediterranean crossings, such as Spain to Morocco, Italy to Greece, or routes out to the islands.
The longer the crossing, the bigger the risk. On a short hop you may not notice anything; on an overnight ferry your phone has hours to burn data on its own initiative.
Honestly: an eSIM does not help here either
We sell eSIM bundles, so you might expect us to pitch an eSIM as the solution. But that would not be true. A travel eSIM uses the same kind of networks as your regular SIM: networks on land. In the middle of the sea, an eSIM has no coverage either, and your data bundle does not work on the ship's satellite network.
At sea there is only one sensible approach, and it is free:
- Put your phone in airplane mode as soon as the ship departs, or at least turn off data roaming for all your SIMs. Then nothing can connect behind your back.
- Want to be online on board anyway? Use the ship's wifi, if it is reasonably priced. Ferry operators often sell wifi packages per crossing; they cost a fraction of satellite roaming.
- Back on land? Turn off airplane mode and let your eSIM take over. From that moment you are back to browsing at your bundle's rate.
The exact same advice applies on cruise ships, by the way, where the long sailing times make the amounts climb even faster. We wrote a separate post about that: eSIM on a cruise.
How to prepare for the crossing
- Download your entertainment in advance. Films, podcasts and playlists are for home or the harbor, not the open sea.
- Warn your travel companions. Kids with their own phones are a particular risk; turn off data roaming on their devices too.
- Set automatic downloads and photo backups to wifi-only. Then nothing can go wrong even if you do briefly connect.
- Arrange your destination eSIM beforehand. That way you are online the moment you roll off the ferry in Newcastle or Tangier, with no shop hunting required. Our pre-travel checklist covers the rest of your preparation.
Conclusion
Internet at sea is expensive because your phone silently switches to the ship's satellite network, which sits outside all European price agreements. No SIM card or eSIM changes that. The solution is simple: airplane mode on as you sail out, the ship's wifi if the price is fair, and back onto your data bundle once you reach land. That way the crossing stays the cheapest part of your holiday.
Sailing soon? Sort out a data bundle for your destination with our eSIM comparison, so you are online the moment you arrive.