Boat internet for a sailing trip or ocean crossing: the full stack

Staying online on a boat isn't one product — it's a layered stack that changes as you leave the coast. Close to shore your phone does most of the work; a few dozen kilometres out it stops entirely, and you're into satellite territory. This is a researched guide to how those layers fit together for European waters, not a hands-on sea trial — where a figure moves around (hardware prices, power draw), we point you to the provider's own page rather than quote a number that will be stale by the time you read it.

The three zones — and what works in each

• In the marina. Marina Wi-Fi exists but is famously slow and contended; in practice your phone on a travel eSIM or local SIM is faster and more reliable.
• Coastal (roughly within a few dozen kilometres of shore). Ordinary cellular — and therefore travel eSIMs, which ride the same masts — still works, but it's line-of-sight to land towers and fades fast. The UK's Royal Yachting Association is blunt about it: a mobile "is not designed for the marine environment and coverage may be non-existent just when you need it most", so another means of communication is essential. Illustrative range from the sailing press is "usually no more than 15 to 25 miles from shore" — far less for a handheld without a masthead antenna.
• Offshore / blue-water. No cellular at all. You need satellite: a low-earth-orbit dish (Starlink) for real broadband, and a satellite messenger for messaging and safety when the dish is off or down.

The layers you actually buy

1. A travel eSIM — for phone data near the coast

Cheapest data when you can see land. Airalo and Breeze both cover European coastlines with per-country and regional plans. Just remember it's the same cellular network underneath — great in harbour and along the coast, useless once you're properly offshore. Treat it as the cheap inner layer, not your offshore plan.

2. Starlink — broadband once you leave cellular range

For smaller boats and coastal passages, a Roam plan officially covers coastal and inland waters and in-motion use up to 12 nautical miles from shore. To go further, Roam Unlimited subscribers can switch on Ocean Mode — a pay-per-GB add-on that extends coverage into open ocean beyond the 12 nm limit.

For frequent or long ocean passages, Starlink's dedicated maritime service is Global Priority (global land-and-ocean coverage), sold in 50 GB, 500 GB, 1 TB and 2 TB monthly tiers. Starting prices on Starlink's maritime page ran from roughly €250 to €2,150 per month when we checked on 16 July 2026 — these are "starting-at" figures that Starlink revises periodically and that vary by region and VAT, so confirm the current number on Starlink's own page before budgeting.

On hardware: use a dish rated for in-motion use — Starlink Performance (Gen 2 or 3), Standard 4 / 4X, or the compact Starlink Mini for a smaller yacht. Avoid the motorised/actuated dishes (Standard Actuated, Performance Gen 1), which Starlink says are not designed for in-motion use. Note the naming changed in 2026 — the old "Flat High Performance" is now "Starlink Performance (Gen 2)", so ignore older guides still using the "Flat High Performance" or "Maritime plan" labels. If you're departing from the Mediterranean, one useful quirk: in-motion maritime use is explicitly permitted in a list of regions that includes Spain, even where in-motion use on land isn't.

Full transparency: Starlink has no affiliate or publisher programme, so the Starlink links above earn us nothing — they go straight to Starlink's own pages. Anyone showing you a "Starlink affiliate" deal is misrepresenting a customer referral scheme.

3. A satellite messenger — safety and messaging for blue-water

Even with a dish, you want an independent, low-power comms layer that works when the dish is stowed, unpowered, or down — for weather, check-ins, and emergencies. The mainstream 2026 options:

• Garmin inReach (Mini 3, Messenger, GPSMAP) — two-way global messaging plus interactive SOS to Garmin's 24/7 response centre, over the Iridium network.
• Zoleo — two-way messaging and SOS over Iridium, and notably certified to the EN 60945 marine equipment standard.
• Iridium GO! — satellite voice calling plus SMS through a companion app, with one-touch SOS.
• Apple's satellite features (iPhone 14 and later, via Globalstar) — Emergency SOS and, on iOS 18+, genuine two-way Messages via satellite. Availability is region-gated, so check the current country list before relying on it in a specific sea area.

Starlink's own Direct-to-Cell texting is coming to Europe — Spain (via MasOrange) is in a pilot, and Deutsche Telekom targets a 2028 launch across ten markets — but it is not a usable offshore safety layer for EU sailors today. Don't plan a crossing around it yet. (We track the rollout on our Direct-to-Cell page.)

4. Power — the layer people underestimate

Everything above runs off your boat's 12 V system, and the dish is the single biggest continuous draw — plan your house bank, solar and DC-DC charging around it. Starlink does publish figures: a Mini averages 20–40 W (15 W idle), while the bigger Performance kits average 110–150 W — system-level numbers that shift with temperature and use, so treat them as a planning baseline. Our off-grid power guide does the sizing maths and explains why running a DC dish through an AC inverter quietly wastes power. A portable power station is a simple backup for the nav/comms bench — EcoFlow, BLUETTI and Jackery are the mainstream options.

5. Mounting and cabling

A dish at sea needs a weatherproof mount and a sensible cable run. LinkGear (EU-based, ships across the EU/UK) carries Starlink-compatible marine mounts and accessories.

Which stack for which trip

• Coastal / Mediterranean hopping: travel eSIM + Starlink Roam (add Ocean Mode if you'll cross any open water) + a satellite messenger for safety.
• Ocean crossing: Starlink Global Priority (or Roam Unlimited + Ocean Mode on a tighter budget) + a satellite messenger as an independent backup — plus VHF, always, which no data plan replaces.
• Liveaboard: the coastal stack, with a Starlink data tier sized to how you actually use it.

What we haven't tested — and what to re-check

This is a researched framework, not a hands-on crossing. Before you buy, confirm the moving numbers on the providers' own pages: Starlink hardware prices and the current Global Priority tiers, satellite-messenger subscription plans, and the current country availability for Apple's and Starlink's satellite features. We earn a commission on the eSIM, power and gear links (never on Starlink); it never changes what we recommend — see our methodology.