Real Starlink Maritime performance during an Atlantic crossing: download speeds, latency and signal quality from the Canaries to the Caribbean. Data from a live voyage.
The passage that tests everything
The Atlantic does not tolerate mediocrity. A passage from the Canaries to the Caribbean, or from the Azores to the US East Coast, subjects every piece of equipment aboard to conditions no laboratory can fully replicate: constant salt humidity, hull vibrations, abrupt temperature changes, and extended periods far from any support infrastructure.
For decades, ocean sailors accepted that crossing the Atlantic meant disconnecting from the world for two or three weeks. Starlink Maritime has changed that premise — not as a technological indulgence, but as a tool that directly affects safety, route planning and quality of life aboard during long passages.
Performance benchmark: During Atlantic crossings from the Canaries to the Caribbean, Starlink Maritime maintained average download speeds of 100–180 Mbps at 2,000+ nm offshore, with latency of 30–60 ms. Signal availability exceeded 98% over the full passage — including mid-ocean at 25°N, 35°W. Source: reported data from cruising communities including Noonsite and Cruisers Forum (2024/2025 season).
Starlink coverage in the Atlantic: real data
The Starlink network operates with over 6,000 satellites in low Earth orbit. Coverage in the North Atlantic and Central Atlantic is today practically complete. Even the most remote areas of the ocean, more than 1,500 nautical miles from any coast, receive signal consistently.
Typical performance data on the Atlantic passage (based on user experiences and documented tests):
| Zone | Typical download speed | Latency | Availability |
|---|---|---|---|
| North Atlantic (>40° N) | 80-180 Mbps | 30-55 ms | >97% |
| Central Atlantic (20°-40° N) | 100-220 Mbps | 25-50 ms | >98% |
| Equatorial Atlantic | 60-150 Mbps | 30-60 ms | >95% |
| Caribbean | 100-200 Mbps | 25-45 ms | >98% |
These figures confirm something many ocean sailors did not expect: speeds in the Central Atlantic can exceed what many receive ashore with mediocre cable connections.
How Starlink is actually used on an Atlantic passage
High-resolution weather routing
This is arguably the most important application for navigation safety. With Starlink aboard, access to high-resolution GRIBs, Passage Weather, PredictWind or StormGeo forecast services, and real-time satellite imagery is constant throughout the entire passage.
An ocean navigator without connectivity depended on HF radio weatherfax — a valid technology but with very limited resolution and update frequency. With Starlink, you access the same weather models that professional meteorologists consult.
Shore communication
For crew families and owners, knowing they can maintain fluid communication during a long passage radically changes the experience. HD video calls are possible even from the middle of the Atlantic. This eliminates one of the most common sources of anxiety during long ocean passages.
Remote work aboard
An increasing number of ocean sailing vessel owners are professionals who combine life aboard with their careers. Starlink allows maintaining video call meetings, managing correspondence, accessing corporate systems remotely and working with the same tools as ashore — from 1,000 miles offshore.
Entertainment and life aboard
An 18-21 day passage can feel long. Access to streaming platforms, music, podcasts and digital books markedly improves crew quality of life. This is not a trivial luxury — crew morale is a genuine safety factor on long passages.
Chart and waypoint updates
Navigating with real-time updated charts improves route safety and efficiency. Applications such as Navionics, OpenCPN or Expedition can download chart updates, traffic corridors and NAVTEX notifications directly from the internet.
What Starlink does not replace
We want to be clear: Starlink does not replace emergency communication systems. It functions as an internet and voice/data over IP connection, but does not substitute:
- VHF / SSB Radio: Standard SOLAS emergency communications. Mandatory.
- EPIRB: Emergency position-indicating radio beacon. Mandatory.
- SART or AIS: Identification and tracking systems. Essential offshore.
- Iridium GO or similar: Emergency satellite communication independent of internet. A recommended complement for long ocean passages.
Starlink is an extraordinary connectivity tool, but offshore safety is built on redundancy.
Coverage by distance offshore: measured performance data
One of the most common questions before an Atlantic departure: does Starlink still work 500, 1,000 or 1,500 miles from the coast? The answer, based on documented passages, is yes — and the performance figures are better than most sailors expect.
| Distance from coast | Typical download | Typical upload | Latency | Notes |
|---|---|---|---|---|
| 0–200 nm | 100–220 Mbps | 10–30 Mbps | 25–45 ms | Full performance, high satellite density |
| 200–500 nm | 90–200 Mbps | 10–25 Mbps | 28–50 ms | Minimal degradation in mid-latitudes |
| 500–1,000 nm | 80–180 Mbps | 8–20 Mbps | 30–55 ms | Consistent coverage, occasional brief interruptions during severe weather |
| 1,000–1,500 nm | 70–160 Mbps | 5–18 Mbps | 30–60 ms | Variable by latitude; best in 20°–35°N band |
| >1,500 nm (deep ocean) | 50–140 Mbps | 5–15 Mbps | 35–65 ms | Trade wind zone — LEO coverage complete |
The most critical corridor — the 2,500 nm from the Canaries to Barbados — falls within the 20°–35°N latitude band where satellite density is highest. The degradation of performance with distance is real but gradual; the service does not cut out. What changes is peak speed during heavy use, not baseline availability.
Power draw and electrical management on a passage
The Starlink Maritime Flat High Performance antenna draws 40–75W in normal operation, with peaks reaching 110W during satellite acquisition and intensive data transfers (large GRIB downloads, software updates).
For a typical offshore sailing vessel with a 400–600Ah bank, solar panels and a charging alternator, this consumption is entirely manageable with a structured usage schedule:
- Morning weather window: 15–20 minutes for GRIB download and route optimisation — approximately 0.5 kWh
- Midday comms window: 30–45 minutes for video calls, email, chart updates — approximately 0.8–1.0 kWh
- Evening position report: 10 minutes — approximately 0.2 kWh
This schedule consumes roughly 1.5–2.0 kWh/day from Starlink, well within the generation budget of a well-equipped bluewater sailboat. Compared to the continuous power draw of SSB radio and associated equipment, the difference is negligible.
For vessels with tighter electrical budgets (smaller panels, no wind generator), a simple relay switch on the DC panel allows completely powering down the antenna between windows. Re-acquisition takes 30–60 seconds.
Starlink Mini vs Flat High Performance: which for an ocean passage?
| Feature | Starlink Mini | Flat High Performance |
|---|---|---|
| Dimensions | 29.8 × 26.2 cm | 59.5 × 38 cm |
| Power draw | 20–40W | 40–75W (peaks 110W) |
| Marine exterior rated | ❌ No | ✅ Yes |
| Max wind rating | Not specified | 96 km/h |
| Saltwater exposure | Not rated | Designed for it |
| Speeds offshore | 50–100 Mbps | 80–180 Mbps |
| Recommended for ocean passages | ❌ No | ✅ Yes |
The Starlink Mini is a compact, portable terminal designed for light outdoor use — not for permanent exterior marine installation and not rated for the salt spray and vibration of an ocean passage. For an Atlantic crossing, the Flat High Performance is the only appropriate choice. The Mini is a supplementary tool for marina use, not a primary offshore connectivity system.
Hardware on an Atlantic passage: durability and maintenance
The Starlink Maritime Flat High Performance antenna is designed for marine exterior use. It withstands winds up to 96 km/h and is certified for salt water use. During a typical Atlantic passage, the hardware requires no special maintenance.
The only basic care:
- Rinse the antenna with fresh water on arrival in port, especially after periods of intense salt spray.
- Ensure there are no obstructions (such as equipment moved on deck) that might block sky visibility.
- Verify that cabling is properly secured before departure — vibrations on long passages can loosen poorly fastened connections.
Starlink Maritime has changed what an Atlantic passage means. The disconnection that bluewater sailors accepted for decades is now a choice, not a constraint. If you are planning a crossing and want guidance on hardware, plan selection or installation, MaritLink is a Starlink Maritime reseller for bluewater sailors — we advise on the right setup for your vessel, route and usage pattern before you depart.
Frequently asked questions
Does Starlink work in the South Atlantic?
How much power does the Starlink antenna draw on a passage?
Can I switch Starlink on and off to manage power consumption?
Which Starlink plan is most suitable for an Atlantic crossing?
If you are considering Starlink for your vessel, we can help you find the most suitable solution.
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