Key points in 30 seconds
- These are not two competing products: they serve two different needs. The Iridium GO! exec addresses « being able to communicate, anywhere »; the Starlink Mini addresses « having real broadband on board ».
- Iridium GO! exec: global coverage (polar constellation, including poles), two voice lines, light data (up to 88 kbps on Certus 100 service), SOS button linked to a coordination center — but it is neither an EPIRB nor a GMDSS terminal.
- Starlink Mini: compact high-speed Internet, but continuous power draw, no native voice, no SOS function, and coverage/offers that evolve — check the official map at time of preparation.
- For offshore sailing, the reference is not « one or the other »: it is often both — bandwidth on one side, an independent backup line on the other.
- Verdicts by program (coastal, transatlantic, racing, fleet) below — including what each option cannot do.
Table of contents
Two different needs before two technologies
The question « Iridium or Starlink? » is poorly framed. A bluewater crew has two distinct needs:
- Communicate no matter what — make a call, receive a weather file, contact a doctor or a rescue center, even in heavy weather, far from shore, even if the rest of the boat is down. This is a safety and operational need.
- Have bandwidth — video calls, updates, work on board, streaming, crew’s connected life. This is a comfort and usage need.
The Iridium GO! exec is built for the first need. The Starlink Mini for the second. The entire decision stems from this distinction — which is why both are often found together on offshore sailboats.
Iridium GO! exec: what it really is
The GO! exec is a portable satellite access point: a standalone unit (battery rated 6 h in communication, 24 h in standby, IP65) with a touchscreen, creating a Wi-Fi network on board and controlled from a smartphone.
- Voice: two high-quality call lines, from the app or the built-in speaker/mic.
- Data: Iridium Certus 100 service, up to 88 kbps — enough for emails, GRIB files, messaging; not for video calls or full modern web.
- Coverage: the Iridium constellation (polar low Earth orbit) covers the entire globe, including the poles.
- SOS: dedicated button linked 24/7 to the IERCC coordination center (Garmin Response), on subscription to the service.
Do not confuse: the SOS on the GO! exec is an assistance service by subscription. It is neither an EPIRB (autonomous Cospas-Sarsat beacon, no subscription, designed to survive a sinking), nor a GMDSS terminal. On an offshore sailboat, it complements the distress beacon; it never replaces it. See our guide EPIRB vs PLB vs AIS MOB — choosing a distress beacon for your sailboat.
Built-in omnidirectional antenna: no aiming required, but a real requirement for clear sky view. On a sailboat, a unit placed in the cockpit under the bimini will not offer the same reliability as a well-thought-out installation — let’s discuss this before departure.
Starlink Mini: what it really is
The Starlink Mini is a compact all-in-one flat antenna (integrated Wi-Fi router) that delivers high-speed Internet — on par with a good fixed connection — in areas covered by SpaceX’s low Earth orbit constellation. We documented real-world measurements on board in Starlink Mini on sailboat — field installation and performance 2026.
- What it delivers: bandwidth, plain and simple — video calls, cloud, streaming, work on board.
- What it does not deliver: no native voice line (voice uses VoIP over Internet), no SOS function or maritime safety service, and no internal battery: it is a permanent electrical consumer on board.
- What changes fast: plan names, roaming and usage conditions at sea, pricing and coverage maps evolve regularly. None of this information should be considered fixed — including in this article.
Coverage and dependencies
This is the real differentiator between the two systems:
- Iridium: global coverage by design, including poles and high latitudes. This is its raison d’être — which is why it remains the tool for extreme zones.
- Starlink: broad coverage in usual recreational boating areas, but dependent on the subscribed plan and the current coverage map — use in open ocean and certain waters is subject to specific conditions that have already changed several times. Workshop rule: check the official coverage map and plan conditions for your precise route, at the time of preparation, not six months prior.
Another dependency to factor in: Starlink assumes a healthy electrical system on board (see the power section). Iridium, on the other hand, runs on its own battery — which is precisely what you expect from a backup means.
Comparative table
| Criteria | Iridium GO! exec | Starlink Mini |
|---|---|---|
| Need covered | Communicate anywhere, anytime | High-speed Internet on board |
| Coverage | Global, including poles | Broad but evolving — check official map for your route |
| Data | Up to 88 kbps (Certus 100): emails, GRIB, messaging | High bandwidth: video calls, cloud, streaming (field measurements in our article) |
| Voice | Native, two lines | VoIP over Internet only |
| SOS / safety | SOS button to IERCC (on subscription) — does not replace an EPIRB | No safety service |
| Power | Internal battery (6 h comm. / 24 h standby) + 12 V recharge | Permanent power draw from the boat |
| Antenna | Built-in omnidirectional, clear sky view required | Compact flat antenna, clear sky view required |
| Resilience | Independent of the boat once charged | Depends on the boat’s power and installation |
Iridium specs verified on iridium.com on August 10, 2026. Prices are intentionally omitted here: they are on the product pages and change with offers.
Power: the underestimated criterion
A GO! exec draws little from the boat: it recharges like a mobile device and runs on its battery during the watch.
A Starlink, on the other hand, draws power continuously while powered — several tens of watts that, over 24 hours, really impact a sailboat’s battery bank. Before taking a Starlink on a crossing, the question is not « where to mount it » but « does my power budget absorb it ». Run the numbers with our sailboat lithium bank sizing method (built-in calculator), and plan a dedicated switch: a Starlink turned off at night changes the budget.
Plans, SIMs and activation
Without copying rate grids that will be out of date in three months, here is the structure of both worlds:
- On the Iridium side: access requires a SIM and credit — either prepaid (a volume of minutes/data with an expiry date, to be activated before departure), or a subscription. The prepaid pitfall: the activation date and credit validity — a line activated too early or credit expired in the middle of the Atlantic are the two classic errors. We supply SIMs and plans and align activation with your departure date.
- On the Starlink side: monthly subscription, subscribed directly with Starlink, with roaming plans whose conditions (use at sea, data priority, monthly suspension) evolve — re-read at time of subscription, no memory.
Workshop verdict by program
Coastal and summer Mediterranean: start with a 4G/5G router or a Starlink depending on your usage — Iridium is only justified in coastal waters for specific requirements (white zones, professional redundancy).
Transatlantic and tropical cruising: the combo is the reference — Starlink for daily bandwidth, GO! exec charged and tested as an independent backup line separate from the boat. If the budget forces a single choice, it comes down to your relationship with risk and disconnection, not comfort: the backup communication means takes priority.
Offshore racing: most rules require specific satellite communication means — it is the race rules that decide, not a comparison. The GO! exec fits this logic; check the required equipment list before any purchase.
Fleet, charter, delivery: the Iridium argument is operational: a standalone unit that moves from boat to boat, controlled costs with prepaid, no dependency on each unit’s electrical installation.
High latitudes and extreme zones: Iridium, no debate — it is the only one with structural polar coverage.
Onboard installation
For the Starlink Mini, a clean installation comes down to three points: a position with clear sky view (clear of the boom and rigging shadow), a watertight cable pass-through, and protected power with a dedicated breaker. Skysat distributes dedicated Scanstrut mounts:
- PowerTower aluminium mount — high, clear mounting;
- PTM-R2 multi-mount mast — Starlink + additional antennas on the same aft mast;
- Ø30 mm watertight deck gland and Cable Seal horizontal — no drilling without dedicated sealing.
For details (position, wiring, real-world bandwidth measurements), see our field installation article. For the GO! exec, the challenge is simpler — a sky-view location, its charger, and a complete test before departure, including test call and SOS per the service procedure.
FAQ
Does the SOS on the Iridium GO! exec replace an EPIRB?
No. It is an assistance service by subscription, linked to the IERCC coordination center — valuable, but dependent on the unit, its battery and the service subscription. The EPIRB remains the reference distress beacon (Cospas-Sarsat, autonomous, designed for sinking). They complement each other; neither replaces the other.
Does Starlink work underway, in motion?
Yes on adapted roaming plans, the antenna requiring no mechanical aiming. Exact conditions (required plan for sea use, data priority) evolve regularly: check the current offer at time of subscription. Our real-world measurements are in the field installation article.
Is an Iridium useful in the Mediterranean?
For most Mediterranean programs, no — 4G/5G and Starlink cover usage. It becomes relevant again as an independent redundancy for professional use, delivery, or a rally with specific equipment requirements.
What to check on a prepaid Iridium SIM before departure?
Three things: the activation date (set to departure, not purchase), the credit validity period for the entire crossing, and a complete test of the unit + SIM + app before casting off. We align activation with you at time of order.
What real-world bandwidth can I expect from each solution?
GO! exec: up to 88 kbps (Certus 100 service) — emails, GRIB and messaging, no video calls. Starlink Mini: real high bandwidth, variable by zone and network load — our onboard measurements are documented in the field installation article rather than promised here.
Further reading
- Starlink Mini on sailboat — field installation and performance 2026
- Marine 4G/5G routers vs Starlink — coastal connectivity
- EPIRB vs PLB vs AIS MOB — choosing a distress beacon for your sailboat
- Fixed VHF vs portable + AIS Class B — sailboat safety
- Iridium catalog (terminals, SIMs, plans) · Starlink mounts · Satellite communications
About the author
Pol Conin, Digital Manager at Skysat. Software engineer and tech entrepreneur, Pol joined the adventure to bring Skysat into the digital age. See his author page for the full list of articles.
Transparency: Skysat distributes Iridium terminals (GO!, GO! exec, 9575), Iridium SIMs and plans, and Scanstrut mounts for Starlink. The Starlink kit itself is purchased directly from Starlink — we advise and install. This does not change the specs cited, nor the cases where we advise against a purchase.
