Most port days go fine with a phone in your pocket. The trouble starts when the signal drops, roaming does not connect or the battery runs low just as you need a ticket, a map or the time the ship leaves. This guide covers what to prepare so that a weak signal is an inconvenience, not a crisis. For data plans themselves, see eSIMs and staying connected.
1. Which tickets work offline, and which need activating
Ticket rules differ by operator, so read each one. Two examples, from the pages read on 26 October 2026:
- Ferries booked through Ferryhopper. It says most Greek and Italian, and some Spanish, ferry companies provide e-tickets (marked with a QR code icon), except Fast Ferries in Greece, where printing is needed. Without an e-ticket you collect a paper ticket from the points listed in your confirmation email, and only very few companies let you board with the confirmation email alone.
- Seattle's Water Taxi and the Transit GO Ticket app. King County says internet access is needed to buy a ticket but not to activate it, if you choose to save tickets on the phone; tickets stored in the cloud need Wi-Fi or mobile data to access and activate. For the Water Taxi, it says to activate within 2 hours of departure and show the ticket to a crew member before boarding.
The lesson: buy and download on the ship's Wi-Fi or in port the day before, choose on-device storage where the app offers it, and know whether the operator wants a printout.
2. Save meeting points and official contacts
Copy the meeting point exactly as the operator writes it, with its phone number and opening hours. King County, for instance, lists Water Taxi contact details with office hours of Monday to Friday, 8 am to 4:30 pm, so a weekend call may not be answered. The CDC also suggests learning the numbers for emergency services in the destination you are visiting. Keep these on paper as well as in your phone.
3. Carry a paper return summary
One small card, written on board: the ship's name, the port and berth or terminal name as your line gives them, the all-aboard time, the line's port contact if it provides one, and the ticket and tour details for the day. This matters most if you go independently: Royal Caribbean says the ship waits if a tour booked through it is delayed, but that guests who book their own excursions are responsible for being on board before the scheduled departure.
4. Prepare navigation that does not depend on roaming
Offline maps help, but read the limits. Google's help page says that offline, transit, cycling and walking directions are unavailable; driving directions work only if the whole route is inside the downloaded area. Offline maps must be updated before they expire, and some countries or regions cannot be downloaded at all. So download the area, but also mark your route and the way back to the port on a paper map or a screenshot.
5. Keep document backups secure and minimal
GOV.UK's travel checklist suggests having a backup plan for accessing key information if you lose your phone, by sharing it with friends or family or storing it online with a secure data storage platform. It also says to complete the emergency contacts page in your passport and to print health insurance documents and carry a copy. Carry only what the day needs, and leave the rest in the ship's safe or with someone at home.
6. Run an offline test before you leave the ship
Ten minutes before going ashore, switch your phone to airplane mode and check:
| Check | Works offline? |
|---|---|
| Each ticket or QR code opens without a connection | |
| The ticket app does not ask you to log in | |
| Offline map shows the port and your route | |
| Paper card: ship, port, all-aboard time, contacts | |
| Printouts the operator requires | |
| Battery charged, and a charger or power bank if you carry one |
Practical demands to verify on the day: Ferryhopper advises arriving at least 1 hour before departure and warns that reaching the gate at a large port such as Piraeus can take up to 30 minutes on foot; the Water Taxi takes no reservations, so all passengers wait in line. Build that time into your return plan.
Related: a ferry booking is not always a boarding pass and the all-aboard worksheet.