Starlink on a sailboat.

Power realities, salt corrosion, anchored versus underway, and the very real difference between Roam and Maritime plans. The honest report from six months at sea.

The short version

Starlink works exceptionally well on a sailboat, with caveats. The right plan depends on whether you stay in coastal waters (Roam works) or sail offshore beyond cellular range (Maritime is needed). Salt and humidity will slowly degrade the hardware. Power management is the trickiest part. Done right, it is the closest thing to home internet at anchor that has ever existed at this price.

Roam vs Maritime: which plan

Most sailors do not need the Maritime plan. The decision comes down to where you sail.

Roam (Regional or Global) is enough if

• You stay within ~10 miles of shore (well within Starlink's coastal coverage zone).
• Your typical sailing is bay, lake, near-coast cruising.
• You can tolerate brief connection drops while the dish handles motion.

Roam Regional ($50/mo US) covers one continent's coastal waters. Roam Global ($165/mo) covers worldwide coastal use. Both work fine at anchor or under sail in most cruising areas. The Mini dish on Roam is the most popular setup for cruisers under 50 feet.

Maritime is needed if

• You sail offshore (Atlantic crossing, Pacific routes, blue water).
• You need guaranteed connectivity in motion at sea.
• You require high data priority for business operations on a vessel.

Maritime plans start around $250/month and require the High Performance dish ($2,500). Total cost difference vs Roam is significant. For most cruising sailors who do not cross oceans, Roam Global at $165/month works better than Maritime.

Power: the actual hard part

The Standard dish draws 50 to 75 watts continuously. The Mini draws 25 to 40 watts. Either is significant for a sailboat house battery bank. Real-world numbers from a typical 600 Ah lithium bank with the Mini:

Practical advice: do not run the dish 24/7 unless you have generous solar. Most cruisers turn it on when needed (a few hours of evening internet) and off the rest of the time. The Mini's instant-on (under a minute) makes this practical. The Standard takes longer to acquire and is more painful to cycle.

For 12V powering, the Mini accepts 12 to 48V DC directly through its barrel jack, or USB-C PD with a recommended 100W (20V/5A) charger. That means you can power it from a marine USB-C PD outlet or directly from a 12V house battery with a barrel-jack cable. The Standard requires either an inverter or a third-party DC adapter, and inverter loss adds 15 to 20 percent to the power draw.

Mounting and salt

Salt water and salt air are aggressive. The dish itself is rated for outdoor use and seems to handle marine conditions reasonably well. The cable, connectors, and mount hardware are the parts that fail.

Mounting locations

• Stern arch: Best for most cruising boats. High enough to clear sails and rigging. Easy to wire. Removable for storage.
• Mast spreader: Good sky view but very high vibration and movement. Most installs avoid this.
• Bimini frame: Works for the Mini specifically. The Standard is too heavy for most bimini frames.
• Rail mount: Easy and removable. The Mini fits well; the Standard requires a sturdier rail.

Corrosion management

• Rinse the dish with fresh water when possible. Stash a small spray bottle nearby.
• Apply dielectric grease to all electrical connectors quarterly.
• Use 316 stainless or marine-grade aluminum for any custom mount hardware.
• Replace cable connectors annually if you sail in salt water full-time. They corrode internally even when they look fine.

Realistic expectation: a Starlink dish in full-time tropical sailing service typically lasts 2 to 4 years before performance starts degrading. Coastal seasonal cruisers see more like 4 to 6 years. Compared to traditional marine satcom hardware that lasts a decade plus, this is a downside, but the cost difference is so massive that most sailors accept it.

Performance underway

The dish handles motion better than its rating suggests. In moderate seas, the Mini holds connection through normal sailboat motion (heeling, rolling) without drama. In heavy weather, brief drops happen as the antenna's view of the satellites gets interrupted by waves and severe heel angles, but the connection re-establishes within seconds.

Speeds at sea typically run 30 to 80 Mbps on Roam, vs 100+ Mbps at anchor. Latency stays around 30 to 50 ms. Plenty for video calls, weather routing, blogging, working remotely, and even modest streaming. Not great for online gaming during heavy seas, but few sailors are gaming through a storm anyway.

What to know if you are buying

• The Mini is the right dish for most cruising sailboats. Lower power, lighter, smaller, and the speed difference vs the Standard does not matter at sea where you are bandwidth-limited anyway.
• Order in your home country, not in transit. Activation is tied to a billing address, and changing addresses mid-cruise is a hassle.
• Roam Global is worth the upgrade for any blue-water sailor. Not having to switch plans when crossing into a new region's water is worth $115/month if you cross oceans.
• Carry a spare cable. The most likely failure point is the cable getting damaged by chafe or saltwater intrusion at the connector.
• Set up before you leave the dock. Test the install in port, configure the app, learn the failure modes, run a few days of normal use before relying on it for offshore comms.

For a sailboat, especially a cruising one, Starlink has fundamentally changed what is possible at sea. It is not perfect, but the price-to-capability ratio is unmatched, and at anchor it works just as well as a fiber connection at home. Worth every penny for sailors who actually live or work afloat.