Wi-Fi for marinas and waterside

Propagation over water is not free space

Open water gives you excellent line of sight and a serious multipath problem at the same time. A smooth water surface is a good reflector, so a signal reaching a boat arrives both directly and via a reflection off the water, arriving fractionally later. Depending on geometry, those two paths can reinforce or partially cancel each other, which produces coverage that varies in an unhelpful way with height, distance and — because the surface moves — with the state of the tide and the sea. It is entirely possible to have strong signal at one berth and a weak one two along, for reasons that have nothing to do with distance.

Tidal range compounds it. On a marina with significant range, pontoons and the vessels on them rise and fall by metres, changing the angles between the antenna and every device on the water several times a day. A design based on a single measurement at a single state of tide has measured one of several buildings.

Boats obstruct each other

A hull is not transparent, and a mast, radar arch, flybridge or dodger even less so. A full marina is a field of metal and GRP obstructions arranged in rows, and the device that matters is usually inside a vessel — below deck, behind a coachroof, or in a steel or aluminium hull that behaves like a shielded box. Coverage measured on an open pontoon in winter with half the berths empty is not coverage at a berth in August.

Salt, damp and ultraviolet

The marine environment is comprehensively hostile to hardware. Salt-laden air corrodes connectors, penetrates poorly sealed enclosures and destroys anything with an unprotected metal fixing. Constant damp finds every gland that was not tightened properly. UV degrades cheap enclosures and cable jackets. Equipment that would run for a decade in a car park will fail in a marina in a fraction of that if the specification, the sealing and the fixings are not right, and a failed access point at the end of a pontoon is an expensive thing to attend to.

Getting power and data to where the coverage has to be

This, in practice, is where marina projects are won or lost. Access point positions on pontoons, piles, dock offices, boatyard buildings and lighting columns need both power and data delivered across a distance, over water, through structures that move, in an environment where the containment has to be as durable as the hardware. Fibre and armoured cable, marine-rated glands, floating pontoon service ducts, correct bonding and earthing, and surge and lightning protection on exposed positions are all part of the design rather than afterthoughts. Copper runs hit distance limits quickly on a site of any size, which pushes the design towards fibre, and fibre needs a plan for where the terminations and the power live.

Weather, exposure and lightning

Exposed positions on a coast take wind loading that mounting has to be engineered for, and a raised position on an open waterfront is exactly the kind of thing lightning finds. Surge protection and proper earthing on external positions are not optional extras here.

Survey the site as it is used, and account for what changes

We survey the pontoons, the shore facilities and the yard, and we ask about tidal range, berth occupancy through the season, where the largest vessels sit and what is planned. Where the site changes materially between empty and full, the design is worked to the harder case. An on-site survey also finds the interference that a plan never shows — every vessel with its own router, neighbouring premises, and any point-to-point links already in use.

Get the access points close to the boats

The single most effective decision in a marina design is usually to stop trying to cover the water from the shore and put hardware out on the pontoons. Shorter links, lower power, less multipath, far less contention and coverage that survives a full marina. It costs more in containment and power, which is precisely why it is so often not done, and it is the difference between a marina network that works in season and one that does not.

Antenna choice and mounting height

Sector and directional antennas aimed along pontoon runs where the geometry suits, at a mounting height chosen deliberately — high enough to clear the vessels, low enough not to make the reflection geometry worse and not to spray signal across the whole basin. Mounting engineered for wind loading, on fixings that will not corrode away, on structures that move.

Hardware specified for the environment

External-rated enclosures with a sealing rating suited to a marine setting, marine-grade fixings, correctly made-off glands, UV-stable cable, and protection at every exposed position. Where a manufacturer publishes a marine or coastal rating for a product, that is what gets specified — not a general outdoor product in a box.

Power, fibre and containment as part of the design

Fibre backbone out to pontoon head positions with localised power and PoE, armoured or duct-protected routes, floating-pontoon transitions handled with the right flexible arrangement, bonding and earthing to suit the installation, and surge protection on exposed runs. This is the part most Wi-Fi companies price out or hand to somebody else. It is in scope from the start because we install our own designs.

Berth-holders, visitors, staff and systems

Separate networks with policy behind them: berth-holders with an account that persists across the season, visitors with a simple onboarding they can complete from a boat with a phone in one hand, marina office and operational systems protected, and CCTV, access control and any metering kept off the guest network entirely. Bandwidth policy matters here more than in most sectors, because a marina uplink is frequently modest and a small number of vessels streaming can consume all of it.

Yard, hardstanding and shore facilities

Boatyard, workshops, hardstanding, fuel berth, car park, showers and the office are designed as part of the same scheme. Staff and contractors working in the yard need coverage as much as anyone on the water does.