Itinerary connectivity guides
Short answer
The number that decides your purchase is the sea-day ratio. Count the days your ship is at sea and divide by the length of the cruise. Above roughly 35% and the maritime plan is your main purchase; below 35% the port-day eSIM is doing most of the work and the at-sea plan is a small top-up. Everything else on this page follows from that one calculation.
The same eSIM question has a different answer on a four-port Mediterranean week than on an Alaskan Inside Passage sailing. These guides walk the actual route, port by port, and say what we would buy for each.
How to read an itinerary for connectivity
Cruise itineraries divide cleanly into two shapes, and they want opposite purchases. A port-dense itinerary — a Greek Isles week, a Western Mediterranean loop, a Baltic capitals run — has you ashore almost every day, often in a different country. There the expensive problem is land data across five or six networks, and the answer is a good multi-country regional eSIM with a modest maritime plan behind it for the overnight repositioning legs.
A sea-heavy itinerary is the mirror image. Transatlantic crossings, repositioning voyages, Alaskan sailings with long cruising days in the Inside Passage and any Pacific route with two or three consecutive days between islands leave you with hours — sometimes days — where no land network exists at any price. There the maritime plan is the purchase and the shore eSIM is an afterthought.
Most real itineraries sit somewhere in between, which is why we publish the port list and the sea-day count on every guide rather than a single recommendation. Two people on the same ship with different data habits should reach different answers, and they can only do that if they can see the route.
What each guide covers
Every itinerary guide walks the route in order and gives you four things per stop: the port, the country, which local networks actually perform there, and whether your regional eSIM is likely to include it. Between the stops we mark the sea legs and say how long you are genuinely out of terrestrial range — because that, not the marketing on a plan page, is what determines whether you need an at-sea eSIM at all.
Each guide closes with a concrete recommendation naming actual plans and their prices, plus the honest alternative: on a few of these itineraries the ship’s own Wi-Fi package is the better buy, and we say so where it is true.
The itinerary guides
Port-by-port carriers, sea-day coverage and what we would buy.
Port-by-port carriers, sea-day coverage and what we would buy.
Port-by-port carriers, sea-day coverage and what we would buy.
Port-by-port carriers, sea-day coverage and what we would buy.
Port-by-port carriers, sea-day coverage and what we would buy.
Port-by-port carriers, sea-day coverage and what we would buy.
Port-by-port carriers, sea-day coverage and what we would buy.
The mistake almost everyone makes
Buying one eSIM and assuming it covers the whole trip. Ordinary travel eSIMs — Airalo, Nomad, every regional plan on this site — run on land networks, which reach roughly twelve nautical miles out to sea. That is enough for the harbour and nothing else. Only sevenproviders sell data that works in open water: GigSky, Saily and Maya.
The second most common mistake is buying the at-sea plan and forgetting the ports. Saily Cruise in particular activates only beyond twelve nautical miles and does nothing alongside, so on a port-dense itinerary it can leave you offline for most of the trip if bought alone. Read the itinerary first; buy second.