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Canal Boat Marine Communications

Canal Boat Marine Communications

2 min read · Updated 2026-04-08

Canal Boat Marine Communications

What this covers

Communications and connectivity equipment for inland boats: 4G/5G mobile routers and external antennas, marine radios (VHF for tidal sections and the few inland-VHF zones), satellite messengers and emergency PLBs, GPS receivers and chartplotters used inland, AIS receivers for tidal navigation, and TV aerials and reception kit. Installation and antenna tuning is often part of the service.

What to look for

  • For 4G/5G: a router that takes a SIM and an external antenna feed (MIMO if possible). Steel cabin sides are a Faraday cage — internal-antenna phones underperform compared with a roof-mounted external antenna feeding a router.
  • A signal-strength survey before committing to a hardware spec. The right antenna for a boat that mostly cruises rural canals is different from one that lives in a city marina.
  • For VHF: an Ofcom Ship Radio Licence and the user holding a Short Range Certificate (SRC) before transmitting. VHF is rare on the strictly canal network but required on tidal sections of the Thames, Trent, Severn and similar.
  • For TV: an aerial with the right element pattern (Group A, B, C/D or wideband) for the regions you cruise; a single fixed aerial rarely suits both London and Birmingham.
  • Tidy installation: cable entries sealed, antenna mounts that don't introduce a leak, surge protection on the coax.
  • Red flags: 4G "boosters" sold without MIMO antennas, VHF sets installed without licensing advice, internal-only TV aerials sold for steel boats.

Common questions

Will my phone work everywhere on the cut? No — there are persistent dead spots in cuttings, tunnels and rural areas regardless of network. A roof antenna feeding a router improves things significantly but doesn't create signal where there is none.

Do I need VHF on canals? Strictly canal cruising, no. As soon as you go onto tidal water — Thames tideway, Trent, Severn estuary, Ribble Link — you need VHF and the operator licence.

Starlink or 4G? Starlink works almost anywhere with a clear sky view but needs a solid power budget and a clear horizon. 4G is cheaper and lower-draw where coverage is good.

Best network for canals? Coverage is patchy enough that many liveaboards run two SIMs on different networks and a router that switches between them.

Can I get a UK TV signal everywhere? No — canal cruising crosses transmitter regions and you may need to retune or change aerial group.

When you need this

Setting up working-from-the-boat connectivity, pre-tidal-cruise VHF fit, installing a chartplotter for a wide-river or estuarial trip, replacing a failed router or aerial, after moving moorings to a new region.