Getting Internet on a Narrowboat: What Actually Works for Full-Time Living
The most reliable way to get internet on a narrowboat is a 4G or 5G mobile router with an external roof-mounted antenna, because a narrowboat’s steel hull blocks the signal a phone alone can pick up. Satellite systems like Starlink work well as a backup, or a primary option, wherever mobile coverage runs thin.
This guide covers why signal is weaker on board than it looks from outside, how a router and antenna setup actually works, whether Starlink is worth the cost, and what to check with your builder before the boat is finished.
Why Is Internet Weaker on a Narrowboat Than It Looks?
A narrowboat’s steel hull acts like a Faraday cage, absorbing and reflecting the radio waves that carry mobile signal, so a phone that shows full bars on the towpath can drop to one bar the moment you step inside.
This is worse on a well-built boat than a poorly built one. Our guide to narrowboat steel thickness covers why 6mm hull sides and 5mm cabin sides matter for durability, but the same steel that keeps you warm and dry works against you on this one point.
Moored away from a mast, some boaters find they need to stand by a window just to send a text. For anyone planning to live aboard full-time or work remotely, that isn’t good enough on its own.
What Is the Best Way to Get Internet on a Narrowboat?
For most full-time liveaboards, a dedicated 4G or 5G router paired with an external roof-mounted antenna is the most reliable setup, because it moves the aerial outside the steel hull entirely rather than fighting the signal from inside it.
A dual-SIM router, typically £150 to £300, lets you switch networks or run two providers at once, so a weak spot on one network doesn’t mean no signal at all.
An external antenna, roof-mounted and cabled into the router, typically adds £50 to £150 and makes the single biggest difference to signal strength of any one upgrade.
A rolling monthly data SIM, rather than a capped home broadband contract, gives you the flexibility to change network if you move somewhere with poor coverage.
Router + external antenna: £200-£450 setup, £30-£60 a month. Best for full-time liveaboards wanting a permanent setup.
Starlink: £300-£350 setup, £75-£100+ a month. Best for remote moorings with poor mobile coverage.
Marina WiFi: none or often included, £0-£80 a month. Best for boats on a single marina berth most nights.
Phone as hotspot: no setup cost, existing plan cost. Best for occasional use or as a backup.
Which Mobile Network Has the Best Canal Coverage?
No single network covers the whole canal network well, which is exactly why most liveaboards end up on a dual-SIM router rather than committing to one provider.
Coverage varies more by location than by network brand. A network that’s excellent on the Grand Union around London can be patchy on the Llangollen or the upper reaches of the Trent and Mersey. Ask other boaters moored nearby which network they use before you commit to a long contract, since local, current experience beats any national coverage map.
Is Starlink Worth It on a Narrowboat?
Starlink is worth considering if you cruise remote stretches of the network with genuinely poor mobile signal, or if you work from home and can’t risk being offline. At around £75 a month plus roughly £300 to £350 for the hardware, it’s a real cost rather than a small upgrade.
The dish needs a clear view of the sky, which usually means a roof mount, and it draws considerably more power than a 4G router. That’s worth factoring in if you’re running off solar and our comparison of lithium and lead-acid battery systems is a good place to check your capacity against it. If a lithium battery bank is part of that setup, remember most insurers require lithium-ion batteries to be declared, and some won’t pay out on a fire claim if they weren’t.
What About Marina WiFi?
Marina WiFi can work well as a backup, but it’s rarely reliable enough to be your only connection, since bandwidth is shared across every boat on site and speeds drop when the marina is full.
Some marinas include WiFi in the berthing fee, others charge for it separately, and quality varies enormously from one marina to the next. Treat it as a bonus alongside a router and antenna, not a replacement for one.
What 20 Years of Building for Liveaboards Has Taught Us About Connectivity
Connectivity comes up in nearly every specification conversation we have with liveaboard buyers, because a boat that looks finished on the outside is only half the job if you can’t get online inside it.
We’ve been building narrowboats since 2003, and the boats that work best for full-time living are the ones where the owner thought about router placement, aerial routing, and power draw at the specification stage, not after moving in. It’s a five-minute conversation at that stage and a much bigger job once the boat is finished, which is the same reason it’s worth reading our guide to choosing a narrowboat builder before you commit to anyone.
What to Ask Your Builder About Internet and Connectivity
A few questions worth asking before your boat is finished:
Is there a planned cable route from the roof to wherever the router will sit?
Is there a dedicated power socket for the router near where you’ll actually use it?
Has the roof been prepared for an aerial or Starlink mount, or will that need retrofitting later?
If you’re planning to run Starlink or a router off batteries, does the electrical spec have the capacity for it?
Frequently Asked Questions
Does mobile phone signal work on a narrowboat?
Sometimes, but a steel hull weakens signal significantly, so a phone alone often struggles once you’re away from a window or moored in a dip. Most full-time liveaboards add a router and external antenna rather than relying on a phone.
Which is better for a narrowboat, a 4G router or Starlink?
A 4G or 5G router with an external antenna is cheaper and sufficient for most moorings. Starlink is worth it mainly where mobile coverage is genuinely poor, or as a backup. Many liveaboards eventually run both.
How much power does a router or Starlink use on a narrowboat?
A 4G router typically draws very little, a few watts continuously, while Starlink draws considerably more, enough that off-grid boats need to plan for it in their battery and solar capacity.
Can I get free WiFi at a marina?
Some marinas include WiFi in the berthing fee, others charge separately, and quality varies a lot by site. It’s a useful backup, not a reliable sole connection for full-time living.
If you are working through the decision to commission a new-build narrowboat, download The Retired Adventurer’s Narrowboat Buying Guide from jdnarrowboats.com/free-guide. It covers new versus second-hand pros and cons, a self-assessment quiz, the 10 essential questions to ask any builder, red flags to watch for when viewing boats or vetting builders, a full one-time and annual cost breakdown, and cruising lifestyle cost options across continuous cruising, residential mooring, and hybrid arrangements.
The Bottom Line
Internet is one of the few genuinely modern problems on a boat built the old-fashioned way in steel. The fix isn’t complicated: a router and external antenna solves it for most liveaboards, Starlink covers the gaps, and marina WiFi is a nice extra rather than something to rely on. It’s far easier to plan for at the specification stage than to bolt on afterwards.