Once you cross the VHF horizon, roughly 20 to 30 nautical miles from a coastal relay, your handheld radio becomes a short-range intercom for whatever hulls happen to be nearby. Beyond that, you need something that talks to a satellite. Which one, and through what device, depends on how far offshore you actually go, what you want to send back, and how much you are willing to pay per byte. Here is how the current landscape looks for a European skipper planning ocean passages or extended offshore cruising.

Why satellite, not just VHF and EPIRB

Your EPIRB is a one-shot emergency beacon. You activate it, Cospas-Sarsat picks up the 406 MHz signal, and the MRCC gets a position. That is it. No two-way conversation, no weather download, no "we're fine, just delayed 12 hours" message to family ashore. VHF, even with DSC, is line-of-sight plus a bit of atmospheric bounce. Neither covers the middle ground : ordinary offshore communication, weather routing, position reporting, and non-mayday emergencies where you need advice rather than rescue.

That gap is what a satellite communicator fills. It gives you two-way messaging, position tracking your shore team can watch, and in most cases an SOS button routed to a professional emergency response coordination centre. Some units go further and provide voice or full IP data. The trade-off is always the same triangle : coverage, bandwidth, and cost per message.

Garmin inReach and the Iridium short-burst family

The inReach range (Mini 2, Messenger, Explorer variants) is the most common satellite communicator on European cruising boats under 15 metres. It runs on the Iridium short-burst data network, which is the only truly pole-to-pole constellation. If you sail to Svalbard, Cape Horn, or across the Southern Ocean, Iridium is the only network that reliably works everywhere.

What you get in practice :

  • Two-way text messages, roughly 160 characters, to any phone number or email.
  • Preset messages (free on most plans) for routine "anchored safely" or "underway" pings.
  • Position tracking at intervals from 2 minutes to 4 hours, visible on a shareable MapShare page.
  • Weather forecasts pulled on demand, billed per request.
  • SOS button linked to Garmin Response (formerly GEOS), a 24/7 coordination centre that interfaces with the relevant MRCC.

Limitations worth knowing : messages can take 30 seconds to several minutes to deliver in bad sky conditions, the screen is small, and the device is a communicator, not a chartplotter. Plans in Europe are month-to-month, which suits seasonal sailors. Expect roughly 15 to 65 euros per month depending on message allowance, with a one-time activation fee.

Iridium GO and Iridium GO exec

If a single-line texter feels tight for a transatlantic, the Iridium GO and the newer GO exec step up. Both create a small Wi-Fi bubble on board that your phone, tablet, or laptop connects to. The original GO gives you compressed email, GRIB weather files through services like PredictWind or Squid, low-fi voice calls, and messaging. The GO exec, launched more recently, uses the Iridium Certus network and delivers meaningfully faster data (still slow by shore standards, but usable for real email attachments and higher-resolution GRIBs).

This is the tool of choice for ocean racers, delivery skippers, and blue-water cruisers who want proper weather routing sessions rather than a single wind arrow. The hardware costs more (roughly 900 to 1,600 euros for the GO, more for the exec) and airtime plans are heavier, typically 130 to 200 euros per month for unlimited data on legacy GO, less on capped plans. You mount an external antenna and forget about it.

Before you rely on it, spend a day at the dock testing the workflow end-to-end : GRIB download, sending an email with a photo attached, an SOS drill through your shore contact. Discovering that your compression settings are wrong halfway across Biscay is not the moment.

Iridium is not the only game, and 2024 has genuinely shaken the market.

SPOT devices (Globalstar network). Cheaper hardware and cheaper plans than inReach, with SOS and tracking. The catch is coverage : Globalstar is patchy above roughly 70 degrees latitude and has holes in parts of the Indian Ocean and South Atlantic. For Mediterranean and coastal North Atlantic sailing it works. For a round-the-world route it does not.

Apple and Android satellite messaging. Recent iPhones can send emergency texts and short "Messages via satellite" via Globalstar, and Android is rolling out equivalents on Snapdragon Satellite. Useful as a backup on a coastal trip. Not a substitute for a dedicated communicator offshore : you have no external antenna, no ruggedised waterproofing on the phone itself, and no dedicated tracking service. Treat it as your third layer, not your first.

Starlink Maritime and Roam. The elephant on the coachroof. A flat-panel Starlink dish gives you genuine broadband at sea, tens to hundreds of Mbps, for a monthly fee that is competitive with legacy VSAT. It has changed how charter operators and larger cruising boats communicate. But : Starlink is not a safety device. There is no SOS button, no MRCC integration, no guaranteed coverage in polar regions (yet), and no low-power backup mode if your batteries are struggling. It also draws a lot of current. Most serious offshore sailors now carry Starlink for comfort and an Iridium device for safety. If you are already thinking about power budgets, our piece on extending service battery life is worth a look before you add another 50 to 100 watt draw.

Emerging direct-to-cell services. Starlink, AST SpaceMobile, and others are rolling out satellite connectivity direct to standard phones. Interesting for the future. Not offshore-grade today.

Matching the device to the programme

A practical way to choose :

  1. Coastal and inshore, day sails only : a properly configured VHF with DSC covers most cases. Read our guide on how to properly configure your VHF for safety before you consider spending on satellite. A phone-based satellite messenger is a reasonable backup.
  2. Offshore up to a few hundred miles, seasonal : an inReach Mini 2 or Messenger on a monthly plan. Small, waterproof, runs for weeks on internal battery, does 90% of what most cruisers need.
  3. Ocean passages, blue-water cruising, racing : Iridium GO or GO exec as the primary comms, with a secondary inReach as a redundant SOS device on a different battery. Belt and braces.
  4. Charter operators and liveaboards who want broadband : Starlink for daily use, plus an Iridium device kept charged in the grab bag. Do not fold the safety layer into the comfort layer.

Whatever you pick, integrate it into the passage plan itself. Position reports at fixed intervals, a defined shore contact who knows what to do if a check-in is missed, and a written escalation ladder. This is the same discipline you already apply when you plan a route and when you cross-check your AIS picture for traffic. Comms is another layer of the plan, not an accessory.

What often goes wrong

A few field notes from skippers who have used these devices in anger :

  • Dead batteries at the worst moment. Every satellite device needs power. Have a wired 12 V supply, not just USB, and a hard-mounted location where the antenna sees sky.
  • Untested SOS flow. Garmin Response, and the emergency numbers behind Iridium plans, want to know your boat name, crew count, and shore contact. Fill in the profile properly. Do a live SOS test once (in coordination with the provider, they allow scheduled tests).
  • Shore contact who does not know they are the shore contact. Brief them : what a delayed check-in means, what a full SOS means, which MRCC to call in your operating area.
  • Satellite comms treated as MOB gear. They are not. A person in the water needs an AIS MOB beacon on their vest and a fast return, as covered in our man overboard procedure. The sat comm is what you use afterwards to coordinate.
  • Geolocation confusion. Position tracking is not the same as a mayday. Read our note on geolocation advantages and limitations for the distinction.

The onboard data picture

Satellite communicators handle voice, text, and low-bandwidth safety data. They do not, by design, know anything about your engine hours, your bilge pump cycles, or whether your batteries are drifting toward failure. That is a different data layer, and it belongs on the boat itself, logged locally and synced when connectivity allows. The Oria Box sits in that layer : it reads your NMEA network continuously, keeps a local record of what the boat is doing, and pushes summaries over 4G when you are in coastal range. Pair that with a proper Iridium safety comm offshore and you have both problems solved, without asking one device to do a job it was not built for. What is currently the weakest link in your offshore communication chain : the hardware, the plan, or the person waiting for the check-in ashore?