US How superyachts stay connected
Superyacht internet is rarely a single connection. A modern yacht carries several: cellular modems for coastal waters and port, one or more satellite systems for the open sea, and sometimes shore Wi-Fi or a fixed line when berthed. An onboard router or computer decides which links to use at any moment and presents one network to guests, crew and the yacht’s own systems.
Guests expect the same streaming and video calls they have at home, often many at once, and crew depend on the connection for navigation updates, weather routing, email and remote support. That makes connectivity part of the yacht’s operation, not a guest extra.
The yacht’s own systems use the link too. Engine and generator monitoring, CCTV, security alarms and remote diagnostics from equipment makers all send data ashore, and owners increasingly expect to check the yacht from home while it is unoccupied.
Cellular near the coast
Within range of shore, 4G and 5G are usually faster, lower in latency and cheaper to run than satellite. Masts on land are built for phones at ground level, so yachts use high-gain marine antennas mounted high on the mast to reach further out to sea, typically tens of kilometers in good conditions.
Signal still fluctuates as the yacht moves, and busy anchorages and ports in season can leave networks congested. That is why yachts bond several SIMs from different networks into one link. Our cellular bonding FAQ explains how the traffic is split and reassembled, and our guide to integrating 4G, LTE and 5G covers the modems.
Satellite offshore
Beyond cellular range, satellite is the only option. Two kinds are in use, and many yachts now carry both.
| Connection | Where it works | Typical latency | Strengths | Limits |
|---|---|---|---|---|
| 4G and 5G cellular | Coast, port and anchorages | Around 20 to 60 ms | Fast, low latency, low running cost | Fades with distance from shore |
| GEO VSAT | Most ocean regions | Around 600 ms or more | Mature, wide coverage, stabilized dish | High latency, capacity shared per beam |
| LEO satellite | Most ocean regions, varies by service | Around 20 to 60 ms | Low latency, high throughput | Newer, flat-panel terminal, data plans vary |
| Marina Wi-Fi or shore line | Alongside in port | Varies | No airtime use | Shared, often slow and insecure |
Geostationary (GEO) VSAT uses a stabilized dish under a radome to track a satellite about 36,000 km up, which explains the high latency. Low Earth orbit (LEO) services use constellations a few hundred to around a thousand kilometers up, giving latency close to cellular. Figures vary by service, region and contract.
The onboard network
The connections are only half the system. The network behind them decides how well they are shared.
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Link management. A router or marine computer bonds or balances the cellular links and fails over to satellite as the yacht leaves coverage.
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Separate networks. Guests, crew, entertainment and the yacht’s own systems sit on separate VLANs, so a busy guest network never slows navigation or monitoring.
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Traffic priority. Video calls and operational traffic go first; large downloads and updates wait for cellular or quiet periods.
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Security. A firewall between the internet and the onboard networks, in line with IMO guidance on maritime cyber risk.
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Wi-Fi throughout the hull. Steel and aluminum hulls block signal, so access points are spread through every deck and cabin.
Planning connectivity on a new build or refit
Connectivity is easiest to get right when it is planned with the rest of the yacht’s systems. The aim is a design that the crew can manage and that can take new services as they arrive.
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Cruising pattern. Where the yacht spends its time decides the mix: a Mediterranean charter yacht lives mostly on cellular, an ocean-crossing yacht on satellite.
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Mast and radar arch space. Satellite terminals and cellular antennas need clear sky, separation from radar and each other, and short cable runs.
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Comms rack. Space, cooling and clean DC or UPS-backed power for routers, switches and computers, with room for another terminal later.
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Remote support. Out-of-band access so the integrator can diagnose the network without a technician flying out to the yacht.
Hardware that suits a yacht
Equipment on board has to cope with salt air, vibration, warm enclosed cabinets and continuous running. Bridge and navigation equipment is tested to IEC 60945 and class society rules such as DNV, which our maritime computing guide explains. Fanless computers with wide DC inputs and sealed or conformally coated boards are the usual choice for the comms rack.
In our bonded cellular router case study, a fanless embedded PC with four modems and four SIMs bonds 4G connections on superyachts, giving guests stable internet near the coast. Our marine computers cover the wider range of onboard systems, from bridge displays to engine-room monitoring.
Quick answers on superyacht internet
Superyacht internet: common questions
Can superyachts use LEO satellite internet?
Yes. Maritime LEO services are now widely fitted, often alongside VSAT and bonded cellular rather than replacing them.
Can you get internet in the middle of the ocean?
Yes, by satellite. GEO and LEO services cover most ocean regions. Cellular only reaches tens of kilometers offshore.
How fast is internet on a superyacht?
It depends on the link. Bonded 4G and 5G near the coast and LEO satellite offshore can both deliver broadband-class speeds; GEO VSAT is usually slower and higher in latency.
Why not just use one satellite system?
Resilience and running cost. Cellular is cheaper per gigabyte near shore, and a second path keeps the yacht connected if one service fails.
Does the hull affect onboard Wi-Fi?
Yes. Metal hulls and bulkheads block radio, so yachts need access points throughout rather than one central router.
We build marine computers and multi-modem routers as standard, fitting the modems, SIM trays and antenna connections and setting up the system before it ships.