Does your phone work on a cruise ship?

Not on normal mobile networks once you leave coastal coverage. Ships run their own satellite based maritime network which is billed at very high rates, so most passengers use airplane mode plus the ship's Wi-Fi package instead.

How do people message each other on a cruise?

Most cruise lines have their own app with onboard messaging that works over the ship's Wi-Fi, often as a cheap add-on or included. That is usually the only practical way to message someone on board, and it does not need a data package.

How do you avoid losing your group on a cruise ship?

Use deck numbers and venue names rather than directions, agree fixed meeting times for meals and excursions, and pick one central landmark such as the main atrium on a specific deck as a fallback.

How to find people on a cruise ship without roaming

A cruise ship is the most extreme version of the coordination problem in this whole series, because the usual fallback - “just text them” - does not exist.

Once you are away from the coast, your normal mobile network is gone. Ships run their own maritime satellite network, and it is billed at rates that make a few accidental minutes memorably expensive. So the sensible default is airplane mode for the whole cruise, with Wi-Fi switched on.

Use the ship’s own tools

The cruise line’s app. Nearly every major line has one, and the useful part is onboard messaging that works over the ship’s Wi-Fi. It is often a small add-on or included, and it is usually the only practical way to message someone on board. Set it up and get everyone in your party onto it before you sail, while you still have normal data to download it.

The Wi-Fi package. Whether it is worth it depends on the line and your plans. Even the cheapest tier generally covers messaging, which is the part that matters for finding people.

The daily programme. The printed or in-app schedule is the backbone of the day, and it is what people actually plan around.

Deck numbers are the address system

A ship has an excellent coordinate system already built in: deck number plus venue name, and usually forward, midships, or aft.

“Deck 9, aft, by the pool bar” is precise and unambiguous. “Upstairs near the pool” is not - there may be three pools.

Learn three things on day one and the whole ship becomes navigable:

Which decks have the main public venues.
Where the main atrium or central staircase is - this is the natural fallback meeting point.
Which end is forward and which is aft, and how to tell quickly.

Agree fixed times, not check-ins

Because live messaging may be limited, cruise groups run best on schedule rather than coordination:

Fixed dining times and a fixed table.
A meeting point and time for each excursion, agreed the night before.
A daily fallback: “if we lose each other, main atrium on deck 5, on the hour.”
Note the all-aboard time for every port and treat it as absolute. Ships do leave without passengers.

For port days, agree a meeting point on land too, plus what to do if someone is delayed - including having the ship’s port agent details, which the daily programme lists.

Where a live map does and does not work

On board: essentially not at all. GPS is poor inside a large steel vessel, and sharing a position needs a data connection you probably do not have. Use deck numbers.

In port, it is a different story. Ashore, your group is in an unfamiliar town, often with patchy roaming, trying to reconvene before all-aboard. That is a normal meetup problem and the usual tools work - if you have any connectivity at all.

Where Nearby fits

We build Nearby, and the honest assessment is that on board it is the wrong tool. The ship’s own app and deck numbers win, and nothing I can say changes the physics of steel and satellite billing.

Where it helps is port days: drop a pin on the ship’s berth or on the agreed meeting point in town, share the link, and everyone can find their way back - including relatives on iPhones with no roaming, who open the link in a browser when they catch a café’s Wi-Fi. No app store download on foreign data.

The guide to sharing location abroad covers the wider no-roaming problem, and it applies directly to port days.

The cruise checklist

Download the cruise line’s app before you sail; get everyone on it.
Airplane mode on, Wi-Fi on, for the whole cruise.
Learn deck numbers and the central atrium on day one.
Fixed dining time, fixed table, daily fallback point and time.
Agree a meeting point ashore for every port day.
Know the all-aboard time and the port agent’s number.

Nearby is free on Google Play. Useful ashore on port days; on board, use deck numbers.