Getting Reliable Internet on a Sailboat

Remote Work · Connectivity

The question every sailor asks before they cut the dock lines is: can I actually work from out there? The answer is yes — with the right stack in place. But the stack is not simple, it is not cheap, and it requires some adjustment to how you think about connectivity. The sailors who make it work treat internet infrastructure with the same seriousness they give to their rig inspection. The ones who don't end up anchored off a town with no SIM card, a marina WiFi that tops out at 400 kbps shared across 60 boats, and a 9am client call they cannot make.

The approach that works is layered: marina WiFi as a nominal base, local SIM cards as the primary working tool in most locations, Starlink for offshore passages and high-bandwidth requirements, and a boosted cellular antenna to extend your range as you move away from the coast. Each layer fills a different scenario. None of them works perfectly alone.

Marina WiFi: The Reality

Marina WiFi exists on almost every marina's amenity list. It works, in a technical sense, in almost none of them. The problem is simple: a marina with 200 slips is running a consumer-grade WiFi system that was spec'd for checking email, and now every liveaboard and transient boat is streaming Netflix, running video calls, and uploading files simultaneously every evening. The arithmetic is brutal. A 50 Mbps cable connection shared across 200 boats at peak usage gives you 250 kbps per vessel — if the router can even handle the load, which many cannot.

The specific problems marina WiFi presents to remote workers: shared bandwidth that collapses between 18:00 and 22:00 when every boat is streaming; 2.4GHz-only networks that have limited range and high congestion in dense anchorages; VPN blocking is common, either intentionally or because the router's NAT configuration breaks UDP tunnels; and the access point is almost always on shore, which means a boat at the far end of a long dock has a signal that is barely usable. Some high-end marinas have invested in proper infrastructure — distributed access points, gigabit backhaul, dedicated liveaboard bandwidth — but they are the exception and they charge accordingly.

The practical rule: use marina WiFi for overnight software updates and background uploads. Do not depend on it for any scheduled real-time work. Have your own connection ready.

Local SIM Strategy: Your Primary Working Tool

In coastal cruising — the Bahamas, the Eastern Caribbean, the Mediterranean, the Pacific Islands — a local SIM card bought at the nearest phone shop is almost always your best connectivity option. Mobile infrastructure has expanded dramatically across most cruising grounds in the last decade. Countries that had no data coverage ten years ago now have LTE covering the coastline, if not the interior.

The practical approach: buy a local SIM at every country. Most countries sell tourist SIM cards at the airport or in town with a 30-day data plan for $10–30. For email, Slack, and light browsing, the cheapest plan is enough. For video calls and file uploads, step up to the next tier. Keep a small stock of SIMs from recent countries — you may return, or the coverage at your next stop may be poor enough that you want to hop back to a previous carrier.

The critical pre-departure step is unlocking every device you plan to use with SIMs — your phone and any mobile router. Carrier-locked phones cannot use foreign SIMs. Have this done before you leave your home country; it is trivial to arrange in advance and difficult to sort out at anchor in a remote anchorage. Similarly, unlock any cellular-capable tablet or dedicated mobile router.

Multi-SIM routers — the GL.iNet Mudi or GL.iNet Beryl for budget-conscious sailors, Pepwave or Peplink devices for more demanding setups — accept two or more SIM cards and switch automatically between them based on signal strength, data remaining, or cost rules you define. You put the local SIM in slot A and a global roaming SIM as the backup in slot B. When slot A drops signal, the router fails over to slot B without dropping your connection. The result is a single WiFi network on the boat that all your devices connect to, with the router handling the connectivity complexity in the background.

Starlink: The Game-Changer for Offshore Work

Before Starlink, serious offshore working sailors used VSAT or Iridium, both of which were expensive, slow, and in Iridium's case effectively limited to email. Starlink changed this completely. The Maritime Mobile Priority plan at approximately $250 per month delivers 50–200+ Mbps downloads in most coverage areas, works up to 200–300 nautical miles offshore in the regions where SpaceX has coverage activated, and runs video calls, cloud backups, and VoIP without the constant anxiety that defined offshore internet access for the previous twenty years.

The hardware — the flat-panel "Dishy" antenna — costs approximately $2,500 for the maritime-rated version. It is weatherproof, draws 50–75 watts continuously, and self-orients to find satellites. The occlusion problem is real and annoying: the antenna needs a clear view of a significant portion of the sky, and the mast, boom, and sometimes the main sail in certain configurations will block enough satellites to degrade performance. Most serious sailing installations mount the antenna at the stern rail or on a dedicated pole to minimize obstructions. Trial and error with the Starlink app's occlusion map before you commit to a mounting position is time well spent.

The service is not available in every country. Starlink's coverage map shows maritime activation zones that do not cover all cruising grounds — at time of writing, large portions of the Pacific and some Caribbean nations have regulatory issues. Check the current coverage map before building your work schedule around it. Within covered areas, the service is reliable enough that it genuinely changes what offshore work looks like.

Boosted Cellular Antenna: Extending Your Range Inshore

Between the marina WiFi tier and the Starlink tier, there is a useful middle ground: a boosted cellular antenna that extends your range well beyond what a phone or mobile router's built-in antenna achieves. Marine-rated external antennas from weBoost (the Drive Reach Marine) or SureCall, mounted at the masthead or on a stern pole and connected via coax to your multi-SIM router, can extend usable cellular range from the nominal 2–3nm to 10–20nm offshore in good conditions. This covers a lot of anchoring situations where you are in a bay just outside of town, or anchored off a coastline where the cell towers are inland.

The installation requires running coax from the antenna to the router, which is a one-afternoon job on most boats. The improvement in marginal signal situations — where the router's internal antenna reads one bar and the external antenna reads three — is substantial. The boosted system does not give you signal where there is none; it amplifies the signal that exists and makes it usable rather than borderline.

Speed Benchmarks You Can Actually Work With

Not all remote work has the same connectivity requirement. Understanding what bandwidth each task actually needs helps you decide when your current connection is adequate and when you need to switch to a better source.

Video calls — Zoom, Google Meet, Teams — require 3–5 Mbps symmetric in practice, though the apps will negotiate down to lower quality on constrained connections. At 1–2 Mbps you get choppy video but usable audio; below 1 Mbps, voice-only is more reliable. Email and Slack work comfortably at 1 Mbps or less. Git operations, cloud storage sync, and most SaaS web apps function at 2–5 Mbps; large file uploads and downloads are where speed matters most and where a slow connection becomes a genuine productivity problem. Iridium GO, which uses the Iridium satellite phone network, delivers 2.4 kbps — enough to send and receive compressed plain-text email, and almost nothing else. It is an emergency communication tool, not a working connection, but it is global and functions in the Southern Ocean where Starlink does not.

The practical connectivity philosophy for working sailors: use local SIM as your default in coastal cruising, Starlink when you are offshore or when bandwidth requirements spike, and the boosted antenna to push local SIM coverage further from the coast. Marina WiFi is a bonus, not a plan.

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Frequently Asked Questions

Why is marina WiFi the last resort rather than the primary connectivity option for working sailors? Marina WiFi is shared across 200 boats simultaneously — 50 Mbps marina service delivers approximately 250 kilobits per second per vessel at peak times. The 2.4GHz frequency used by most marina networks is congested, range is limited, and many facilities block VPN connections that remote workers require. Marina WiFi is suitable for overnight software updates but not for video calls or real-time collaboration during working hours.

What is the local SIM strategy for connectivity and what hardware handles multiple SIMs? Local SIM cards are the primary working tool in most locations — 30-day tourist plans cost $10 to $30 per country and provide full 4G/5G speeds without congestion. Devices must be unlocked before departure. Multi-SIM routers that automatically fail over between SIMs include the GL.iNet Mudi and Beryl for budget implementations and the Pepwave/Peplink line for demanding professional use. Automatic failover means the working sailor's connection switches to a backup SIM without any manual intervention when signal drops.

What does Starlink Maritime cost and what are its performance and power characteristics? Starlink Maritime Mobile Priority runs approximately $250 per month with hardware costs around $2,500 for the flat-panel self-orienting antenna. Performance typically delivers 50 to 200 megabits per second or better within coverage range. The system draws 50 to 75 watts continuously — a meaningful electrical load on a boat without robust solar or wind generation. Coverage extends 200 to 300 nautical miles offshore in most areas, with some cruising grounds excluded from the coverage map.

What is the occlusion problem with Starlink installation on sailboats? Starlink requires an unobstructed view of a sky arc to connect to satellites; any mast, boom, or rigging that passes through that arc causes a connection dropout. The self-orienting flat-panel antenna must be mounted high enough to see clear sky in the direction the boat points on most headings. Finding a mounting position that avoids rigging occlusion is a one-afternoon installation problem that requires careful planning before permanently mounting the hardware.

What are the minimum bandwidth requirements for common remote work tasks aboard? Video calls require 3 to 5 megabits per second symmetric — both upload and download — which local SIMs and Starlink provide but marina WiFi often cannot sustain. Email and Slack require approximately 1 megabit per second. Git pushes and cloud file sync need 2 to 5 megabits per second. Iridium GO satellite provides 2.4 kilobits per second — sufficient only for compressed email and position reporting, not professional remote work. These benchmarks determine which connectivity solution is sufficient for each work style.

What does a boosted cellular antenna add to the connectivity stack? A marine cellular booster such as the weBoost Drive Reach Marine or SureCall extends the range of cellular connectivity 10 to 20 nautical miles offshore beyond what a phone or router can achieve on its own. The coax run from the antenna to the booster is an afternoon installation job. The booster does not create connectivity where there is none — it extends the range of existing cellular signals — making it most valuable in coastal cruising areas where towers are within marginal range.