Broadband for a houseboat in the UK: how to get reliable Wi-Fi on board

Living afloat on a narrowboat, barge or houseboat brings plenty of charm, but one practical problem keeps coming up: how do you get a reliable internet connection on a steel hull that moves, or sits on a mooring the phone companies never planned for? The short answer is that almost everyone uses mobile broadband, with satellite as a growing option for remote spots. The detail is where it gets interesting, because the right choice depends heavily on whether you stay put or cruise, and on the signal where you actually moor.

Can you get broadband on a houseboat?

Yes, but rarely in the way a house does. For most boaters a 4G or 5G service paired with the right equipment is the practical choice, because it does not need a cable run from the street to the boat. It can give you a connection wherever mobile coverage is usable, though performance can change a lot between locations.

The number of houseboats on Britain's waterways has roughly doubled over the last 30 years, and while a growing number of permanent moorings now come with internet hookups, continuous cruising (moving from mooring to mooring) makes a steady connection harder to arrange.

Why fixed-line broadband rarely works on a boat

Full fibre, also called FTTP, runs a cable directly to a premises. That suits a fixed home or office but makes no sense for a boat that changes location. FTTC and cable broadband also depend on a fixed service address and a physical installation, so they are really options for residential moorings rather than cruising boats.

Ofcom's Connected Nations 2025 reported that full fibre was available to 74% of UK homes in September 2025. But that figure measures premises availability, and it does not mean fibre can be installed at a marina berth or a towpath mooring.

If you have a permanent, properly addressed residential mooring, a fixed line is worth exploring. You may be able to get full fibre if the mooring has a recognised address, the site owner permits installation and the network can serve that exact spot. Availability has to be checked at the precise address, not assumed from nearby houses or the marina entrance. Before you order, ask the mooring operator whether a fixed-line installation is allowed, and who is responsible for access, wayleaves, internal cabling and any reinstatement work. Installation timing can hinge on survey results and site access, so do not rely on a fixed connection landing in time for an imminent move aboard.

Mobile broadband: the main option for boats

For almost everyone else, mobile broadband is the answer. A 4G or 5G router connects wirelessly to the mobile network, so there is no landline, no cable and no engineer. All you really need is a 12V socket and a usable mobile signal.

There is one quirk unique to boats. Houseboats tend to have thinner walls and less furniture than most homes, so they can sometimes pick up a stronger signal than a bricks-and-mortar property. But most narrowboats and barges are built from steel, which obstructs radio waves and interferes with the signal. That is the central tension of boat internet: the hull that keeps the weather out also blocks the thing you are trying to receive.

One more thing to understand about cruising. A mobile router keeps a stable connection by holding onto one network, so it will not stay connected while you are moving. In practice you reconnect once you have moored up.

Where mobile data via a phone fits in

If you barely use the internet, tethering from your smartphone may be enough, especially if you have a high or unlimited allowance and moor somewhere with a strong signal. It costs nothing extra and needs no kit. The downsides: you are limited to one device, the signal inside a steel boat can be poor (you may end up sitting by a window or stepping outside), and if your network is weak where you moor, you could struggle to get online at all.

Choosing a 4G/5G router or MiFi device

Mobile broadband on a boat usually comes in one of two forms.

A MiFi device is a pocket-sized router that creates a Wi-Fi hotspot on board. Three's 4G MiFi, for example, can connect up to 32 devices, though you will get the best results with around 10 or fewer online at once. It runs plugged in or on up to six hours of battery, which is useful when you are away from power. Three says its 4G network covers 99% of the UK outdoor population. The main limitation is the same steel problem: a small internal unit can still be interrupted by the hull, and some boaters resort to hanging it near a window, which is awkward and risks damaging a device never designed for outdoor use.

A fixed router paired with an external antenna is the stronger setup for heavy use. With the aerial outside, the steel no longer blocks the signal, and you get coverage in every corner of the boat. It takes longer to install and costs more, but it is the closest thing to home Wi-Fi you will get afloat.

Whichever route you take, an unlocked router is worth prioritising. If your chosen network disappoints, you can simply swap in a SIM from another provider without buying new hardware or waiting out a contract.

SIM and data plans: what to look for

Many boaters run a data-only SIM in their router. Pay-as-you-go SIMs give you the most flexibility and let you control spend, while pay-monthly plans are cheaper per gigabyte but tie you in. Longer 12-month or 24-month contracts are cheaper than short-term plans, but it is worth paying a little more at first to make sure you are happy with the network before you commit.

A sensible approach is to try a one or two-month plan, run a speed test where you actually moor, and only then sign up for longer. The Ofcom coverage checker is a good starting point if you spend most of your time in one area. If you are a continuous cruiser, read reviews on how each network performs across the UK, because no map captures the reality of a specific berth.

Read the service terms, too. Some 4G and 5G home broadband services are sold for use at a single specified address, so a moving boat may breach the conditions. Tell the provider how and where you plan to use the connection before ordering, particularly if you cruise for long stretches.

From 17 January 2025, new contracts covered by Ofcom's rules must show any mid-contract price rises in pounds and pence at the point of sale, and inflation-linked rises are banned in those new contracts. Read that wording alongside the minimum term and any early-exit charges.

Boosting a weak signal with antennas and boosters

An external antenna is the single most effective upgrade on a steel boat. There are two types:

• Directional antennas pick up a stronger signal but only from the one cell tower you aim them at. The signal drops if that tower has downtime or heavy traffic. These suit a boat moored in one place for long periods, where you know a reliable tower is nearby.
• Omnidirectional antennas receive from all 360 degrees and prioritise the nearest, strongest tower. For continuous cruisers who never know what is around the next bend, this flexibility usually wins.

Mounting matters. A magnetic pole mount that collapses flat lets you drop the aerial before bridges and tunnels, and if you forget, it is more likely to be knocked over than snapped off.

Be careful with the word "booster". Antennas and in-router amplification are fine. Standalone mobile phone repeaters, on the other hand, are tightly controlled in the UK, so check that any device you buy is one that can be used legally here rather than assuming forum advice is correct.

Starlink and satellite internet for off-grid moorings

Satellite has long been a trans-ocean solution at a high price with substantial running costs. Starlink has changed the economics for remote moorings where mobile coverage is thin. Its roaming plan offers unlimited data at around £96 a month, with the cheapest hardware costing about £299.

That makes satellite the pricier route for most people. By comparison, 5G mobile broadband can be a good deal more affordable, with some unlimited plans starting from around £39.99 a month and roughly £99 for the equipment. Starlink earns its keep where no mobile network reaches, or where you spend long periods well away from towns. If your cruising takes you through areas with decent mobile coverage, the mobile route is usually cheaper and lighter on power.

Marina and public Wi-Fi

Free Wi-Fi is handy but patchy. Some marinas offer it if you pay to dock, and a towpath mooring might put you in range of a nearby pub or hotel network. The catch is obvious: it disappears the moment you move on, so it cannot be your only connection if you cruise.

A marine-grade external Wi-Fi antenna or extender can help here, pulling in a weak marina or pub signal and sharing it around the boat. Think of public Wi-Fi as a useful bonus rather than a dependable backbone.

Powering your internet setup on board

This is the part house-based guides forget. On a boat your router has to live within the limits of a 12V electrical system, and most mobile routers are happy there. A 5G router typically needs nothing more than a 12V socket and a signal. A MiFi device can run off its own battery for a few hours, which is ideal when you want to conserve power or move between spots.

Satellite is the heavier draw. A Starlink dish uses considerably more power than a small mobile router, which matters if you rely on a modest battery bank topped up by solar. If you are off-grid for long stretches, a low-power mobile router is far kinder to your batteries than a satellite system running around the clock.

Typical costs and how much data you need

The figure that matters is the total you will pay over the minimum term, not the headline monthly price. For mobile broadband, add up the recurring charge, any upfront equipment cost, delivery, activation fee and whether the data allowance or fair-use terms suit your household. For a fixed line at a permanent mooring, include installation and any cost of preparing the berth.

As a rough guide from the figures above: an unlimited 5G plan can start around £39.99 a month with about £99 of kit, while Starlink's unlimited roaming runs to about £96 a month with hardware from around £299.

On data, match the plan to how you live. A solo boater doing email and web browsing needs far less than a household with several people working remotely and streaming of an evening. If your income depends on staying online, unlimited data removes the worry of a surprise bill, and the networks are generally fast enough to handle video calls. For work, consistency matters as much as raw speed, so plan a fallback rather than expecting one connection to work flawlessly everywhere.

Which setup is right for your boat?

Use how you live afloat as the deciding factor.

• Permanent residential mooring with an address: check whether a fixed full-fibre line can be installed, with the site owner's permission. If it can, you get the most stable connection going. If not, a fixed 5G router with an external antenna is the next best thing.
• Continuous cruiser: an unlocked 4G or 5G router with an omnidirectional external antenna gives you the best chance of a usable signal wherever you stop. Keep SIM options open and favour shorter contracts until you know a network performs along your routes.
• Remote or off-grid moorings with weak mobile coverage: Starlink is the realistic answer, as long as your power setup can feed it.
• Occasional, light use: tethering from your phone, backed up by marina and pub Wi-Fi, may be all you need.

Whatever you choose, test it where you actually moor, including inside the cabin, before signing a long contract. On the water the only coverage that counts is the coverage reaching your boat.