The essentials in 30 seconds
- Starlink Mini = 2026 standard for latitudes ≤ 60° N/S. Throughput 50-150 Mbps, smartphone app, latency 30-50 ms. Covers 95% of European cruising routes (Atlantic, Mediterranean, Caribbean).
- Iridium = 100% global coverage. Including poles, northern North Sea, Antarctica. Limited throughput (88-512 kbps), ideal for voice and emergency messaging. For North Atlantic crossings and Cape Horn, Iridium remains essential as a backup.
- 2026 offshore combo: Starlink Mini as primary throughput + Iridium GO!exec as backup safety. Covers all possible situations. Budget ~ $1,500-2,500 USD material + $150-300 USD/month combined subscription.
- Skysat distributes Scanstrut installation hardware for Starlink Mini (multi-mast mount, deck gland, cable waterproof gland).
- Workshop verdict: Mediterranean + temperate Atlantic → Starlink alone (~ $50 USD/month). Transatlantic + Caribbean → Starlink + Iridium backup (~ $200 USD/month). Around-the-world + polar zones → Iridium primary + Starlink when available.
2026 marks the end of Iridium’s monopoly on sailboat satellite connectivity. Starlink deployed its low-orbit constellation in 2021-2024 and offers in 2026 the Mini: a flat antenna kit measuring 30×25 cm, perfect for sailboats. But Iridium retains a strategic advantage in extreme zones and safety.
This article distinguishes the two ecosystems by navigation program. For Starlink installation (already drafted in June), see Starlink Mini sailboat installation.
The two technologies — Iridium vs Starlink
Iridium — polar LEO constellation 780 km
66 low-orbit polar satellites (780 km altitude), operational since 1998 (Iridium 1), modernized 2017-2023 (Iridium NEXT). 100% global coverage, including poles. Voice and data service since inception, modest throughput (kbps), but maritime safety service SafetyCast standard since 2025.
Starlink — LEO constellation 550 km
~ 5,000 satellites in 2026, low orbit 550 km. Symmetrical throughput 100-300 Mbps up/down. Coverage between 70° N and 70° S latitude (polar constellation in progressive deployment). No dedicated voice service, but VoIP via smartphone app works perfectly.
Iridium GO!exec — technical details
The Iridium GO!exec is the 2026 offshore terminal standard, successor to the GO!. Compact format, 12 V, integrated antenna.
- Throughput: 88 kbps download, 22 kbps upload (modest but reliable).
- Coverage: 100% global, including poles.
- Services: unlimited voice, SMS, restricted data (email + light web), WhatsApp/iMessage compatible.
- Safety: integrated SOS button, internal GPS, satellite EPIRB alert.
- Material price: ~ $950-1,200 USD.
- Subscription: ~ $130-180 USD/month (depending on data volume).
Starlink Mini — technical details
The Mini is the compact format launched in 2024 for mobility (sailboat, campervan). Flat antenna 30×25 cm, 1.1 kg.
- Throughput: 50-150 Mbps download, 10-30 Mbps upload depending on zone and time.
- Coverage: 70° N to 70° S latitude. Not in northern North Sea, Antarctica, northern Siberia.
- Services: unlimited internet, voice via VoIP (WhatsApp, FaceTime), video streaming possible.
- Safety: no dedicated SOS — operates like standard internet.
- Material price: ~ $500-600 USD (depending on Starlink promo).
- Subscription: ~ $50 USD/month "Mobile Roam" plan (unlimited mobile data), ~ $250-400 USD/month "Mobile Priority" plan (priority throughput).
2026 geographic coverage
The decisive criterion:
- Mediterranean: Starlink excellent (full coverage, max throughput), Iridium as sole backup.
- North Atlantic (westbound crossing): Starlink covers up to 60° N (so Azores + Bermuda), Iridium beyond.
- Caribbean: Starlink excellent, Iridium as backup.
- North Sea, Norway, Iceland: Starlink cuts off at 70° N (Tromsø, Reykjavik OK; Spitzbergen no). Iridium essential.
- Cape Horn / Patagonia: Starlink covers Antarctica in 2025-2027 deployment. Iridium remains essential for safety.
- Around-the-world cruiser: Iridium primary, Starlink as comfort supplement.
Technical comparison table
| Criteria | Iridium GO!exec | Starlink Mini |
|---|---|---|
| Material price USD | ~ $950-1,200 | ~ $500-600 |
| Standard subscription | ~ $130-180/month | ~ $50/month Mobile Roam |
| Download throughput | 88 kbps | 50-150 Mbps |
| Upload throughput | 22 kbps | 10-30 Mbps |
| Coverage | 100% global (poles included) | 70° N to 70° S |
| Voice | Native (unlimited) | VoIP via app |
| Dedicated SOS | Yes, integrated | No |
| Video streaming | No (too slow) | Yes (HD) |
| Antenna format | Integrated 18×18 cm | Flat 30×25 cm |
| Power consumption | 10-15 W max | 25-50 W max |
Workshop verdict by program
Mediterranean + temperate Atlantic (95% of FR cruisers)
Starlink Mini alone (~ $50 USD/month). Covers all waters frequented by European cruising with throughput for streaming and VoIP. Total budget ~ $600 USD/year material amortized over 5 years + $600 USD/year subscription.
One-way transatlantic (10-15% of cruisers)
Combo Starlink + Iridium GO!exec. Starlink 95% of the time (~ $50 USD/month). Iridium as safety backup + marginal coverage zones (~ $150 USD/month). Combined budget ~ $200 USD/month while sailing, possibility to suspend Iridium off high-seas season.
Around-the-world + polar zones
Iridium GO!exec primary + Starlink Mini when possible. Iridium safety always operational. Budget excluding subscription ~ $1,800 USD total material.
Starlink installation — Scanstrut mounts
Skysat distributes Scanstrut mounts for clean Starlink integration:
- PowerTower aluminium mount: stainless telescopic mast for Starlink mount at height (optimal sky visibility). ~ $280-350 USD.
- PTM-R2 multi-mount mast: rear mast mount for Starlink + VHF + additional antennas. ~ $450 USD.
- Deck gland compatible with Starlink: watertight deck gland for Starlink cable (30 mm). ~ $95 USD.
- Horizontal Cable Seal: watertight gland for horizontal cable pass. ~ $35 USD.
FAQ — Satellite for sailboats in practice
Starlink while moving — does it work?
Yes perfectly with the "Mobile Roam" plan. The antenna automatically points at satellites while moving. No connection pause during heel or moderate roll (≤ 30°).
Starlink power consumption over 24h?
25-50 W active = ~ 50-100 Ah/24h. Significant on the energy balance. Plan for dedicated DC-DC + ON/OFF switch to power off at night or in unused mooring.
Is Iridium GO!exec useful in the Mediterranean?
Limited. Starlink covers 100% of the Mediterranean. Iridium is justified only as a safety backup (Starlink failure, antenna issue) — for the average Mediterranean cruiser, Starlink alone is sufficient.
Can I suspend Starlink subscription off-season?
Yes, the Mobile Roam plan is suspendable monthly via app/dashboard without fees. Practical to pay only during sailing months.
Satellite safety — Iridium SafetyCast vs Starlink?
Iridium has included SafetyCast since 2025 (global maritime alerts NAVAREA, MSI). Maritime industry standard. Starlink does not offer an equivalent — it is internet, not a dedicated maritime service.
3 real-world workshop cases — offshore connectivity
Case 1 — Sun Odyssey 410 2025 North Atlantic crossing
Setup: Starlink Mini (material ~ $540 USD + $50 USD/month Mobile Roam subscription) + Iridium GO!exec (~ $1,050 USD + $130 USD/month subscription) as backup safety. Scanstrut PowerTower mount on rear mast. Crossing validation: Starlink operational for 18 days / 21 (zone 70° N → 25° N), Iridium used 3 days at coverage edge. Skipper confirms: "The combo is unbeatable. Starlink for comfort, Iridium for safety."
Case 2 — Mediterranean seasonal sailboat
Starlink Mini alone (~ $540 USD + $50 USD/month). No Iridium needed as Mediterranean is 100% under Starlink coverage. Customer suspends subscription from November to March (savings ~ $250 USD/year). Total install material ~ $750 USD.
Case 3 — Class40 Route du Rhum preparation
Combo Iridium GO!exec (priority safety for racing) + Starlink Mini (comfort data). Iridium enables GRIB Predict Wind and SafetyCast. Starlink enables team email + sponsor videoconference during stopovers. Total material ~ $1,800 USD.
Excluded alternatives — non-retained solutions
- Iridium Pilot (traditional pre-Starlink system): material $2,500-4,000 USD + $200-400 USD/month subscription. Equivalent performance to Iridium GO!exec in throughput. Relevant only for commercial units historically equipped.
- Inmarsat Fleet: oriented toward commercial maritime, rarely used in cruising. Covers same zones as Iridium but with similar throughput and 2× higher material cost.
- Coastal 4G/5G alone: attempts to replace satellite in coastal cruising. Limit: cuts off 5-15 NM from shore, and high cost in international roaming (Italy, Spain, Croatia). Nonsense for safety.
- Legacy Iridium hardware without data plan: Iridium Extreme (Iridium smartphone) included in some boat safety kits. Voice only, no data, not suited for modern offshore internet use.
Practical Starlink Mini installation on sailboat
Best practices for Starlink Mini installation — Skysat workshop
- Antenna position: rear mast or elevated mount 1.5-2 m above deck. Avoid cockpit shadow + rigging.
- Watertight cable: Scanstrut Horizontal Cable Seal for deck gland (~ $35 USD). Do not drill without specific waterproofing.
- Power supply: Starlink Mini consumes 25-50 W. 12 V cable from lithium bank via DC-DC (recommended to stabilize voltage), accessible ON/OFF switch.
- Configuration: activate "Mobile" mode in Starlink app — not "Stationary" mode which assumes a fixed antenna on land.
- Pre-departure test: measure throughput in port (test.starlink.com) — check 50+ Mbps download. If < 30 Mbps, verify antenna orientation and obstructions.
Skysat distributes Scanstrut mounts for Starlink. Iridium and Starlink hardware sold direct from manufacturer — Skysat advises and installs. 2026 USD prices indicative.
