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Iridium GO! A positive feedback [Update]

Iridium GO! cruising

Since it appeared on the market in September 2014 (Eh, yes, 5 years ago !) this device an indisputable ergonomics and excellent quality / price ratio has become a must for sailors out at sea. Easy to implement, without the need for an external antenna (except metal hull) it can be used inside the boat.

A test several weeks, conducted in October and November 2016 during a transatlantic delivery, had already demonstrated its ability to download GRIB weather files and frontology maps despite the low rate (about 10 KB / mn). With the new Iridium NEXT constellation (¹) we notice since 2019 a real improvement in the global coverage without satellite disconnection.

Antenna and reception

The swivel antenna reception quality, which acts as an on/off switch, is surprising. When conveying, the device has been used mostly inside the boat, a Dufour 560, in the cabin or under the protection of the cockpit. I myself did a commissioning in the cabin of a RM 12,60 in the old port of La Rochelle, surrounded by towers and buildings, without any difficulty. This is in support of the previous observation that I had made : an external antenna adds nothing to the reception quality, except in a metal boat. A significant money saving.

Voice / data rate

Voice usage from a smartphone is excellent, the same quality level as Iridium handsets. Despite spacing of satellites in the inter-tropical regions, signal losses are considerably fewer than with the old constellation. For file transfers from an iPad, especially direct downloads of GRIB weather files with Weather4D (²), the observed rate enables average download of 10 KB / minute. On the other hand, This slow rate is largely offset by the following two assets :

Uninterrupted connections…

Unlike with satphones 9555/9575, the messaging app Iridium Mail & Web does not hang Iridium GO! if a transfer is interrupted by loss of signal that can still occur between two satellites. The application remains active and the unit standby resumes itself transfer to the return of the signal of a new satellite. This allows to overcome the maximum size 50 KB imposed by the very short time passage of an Iridium satellite above the boat (5 up to 6 useful minutes), and thus make queries much bigger GRIB files that will be partially transferred by several satellites to full load without the need for servicing equipment. Suffice it to resume the transfer in the email application or Weather4D. It comes immediately to mind communication costs may be prohibitive for use. But…

…and unlimited data

[Update 17/01/2020] Iridium has scheduled a specific offer for GO! with monthly subscriptions with unlimited data. Several types of packages are offered by operators. For example in :

  • Flatrate Calendar (from 1st up to 31 th of the month) : data + SMS unlimited + 150 mn fixed and mobile calls (169 € + 25 € SIM activation)
  • Flatrate Slippery month : (date to date) : data + SMS unlimited + 150 mn voice fixed and mobile calls (179 € + 50 € SIM activation)
  • Flatrate FLEX : (date to date) : data + SMS unlimited + 50 or 150 mn fixed voice calls only (179 or € 199 € + 50 € SIM activation) may be interrupted and placed on hold, lossless number or replacement SIM (optional Stand-by 10,80 € / month). Assigning a US Number to be called least cost.

There are therefore to all needs. And the cost of the package is little more than prepaid cards for Iridium satphone. Actually, if we take as an example a Month Slippery flatrate for an Atlantic crossing Europe – Caribbean, strolling by the Canary and Cape Verde Islands, about 3 months, This is a cost of (179 € x 3)+50 € = 587 €. Six months in the Caribbean, no need for Iridium. Crossing back to Europe in June, passing through the Azores, thus 2 months up to (179 € x 2)+50 € = 408 €. Extended cost = 995 €. Compared to a Special GO prepaid SIM card! limited up to 500mn / or 1000mn voice / data valid 1 year = 998 € (SIM included) France tariff (Orbitica) or to a standard SIM card Prepaid 600mn valid 1 year = 811 € (Orbitica), subscription offer almost the same price a service data + SMS unlimited and 150mn / month for voice.


TRACKAmap offers geolocation service from 8 $/months (to a point all 12 hours), simply programmed Iridium GO! at the rate subscribed to send the GPS position by SMS automatically (even in standby). A web interface allows your loved ones to track your progress at the pace of shipments. With a subscription to unlimited data, no additional cost can be used a higher rate. In addition, nothing prevents the device to be continuously powered at a good location inside the boat (except boat.

SOS emergency

For support function SOS, Iridium has contracted with GEOS Travel Safety Group to provide an emergency coordination measures for Iridium GO! at no additional charge. Just register for free on the page GEOS Iridium and follow the procedure described in the Iridium GO user manual! The service will be operational the setting is completed.

The assistance service offered with the Iridium GO! covers all of the land and maritime activities. Thereby it can be an alternative to an EPIRB (Emergency Position Indicating Radio Beacon). However, for ships flying the French flag, a Cospas-Sarsat EPIRB became mandatory in blue water sailing since May 1 2015 (Entries D240 - 2.08, 240-2.17, D311-Annex A.1/5.6).


All these elements, on the one hand financial, functional on the other hand, offer some attraction to this unit great trip. Although less expensive to buy than Iridium 9575 to which must be added a WiFi gateway (Optimizer WXA-122) and an external antenna + necessary wiring, an adjustable package will offer unlimited data transfers at a cost equivalent to most standard prepaid offers, a lowest market price tracking service, What more could ?

Add, to be complete, that the battery is given for 7 hours continuous talk time, 16 hours standby (According to the transmissions of position adjustment), and its use for a temperature range of-10 ° to + 55 °.

(¹) The new Iridium NEXT constellation is completed
(²) Direct download with Iridium GO!


Author : Francis

Since 2009 independent IT trainer and consultant for boating. Translator of many navigation applications on iOS and MacOS. Professional in boating for over 25 years, I provide training for applications and consulting and assistance for the integration of mobile devices (tablets, smartphones) on pleasure boats.


  1. I realized the same transat in November and aside the quality of calls I confess that the use of this tool has completely satisfied me,

    I do not think it is serious to venture offshore with this unique way as an EPIRB SARSAT. But a great way to keep in touch with the Earth with the opportunity for each person on board to have his own emails.

  2. I am less than satisfied with Go! unit. I have an aluminum boat so require and external antenna. The connector from the Go! unit to the cable is very weak and not a solid connection therefore reception is poor. The only thing we can use is the SMS which works most of the time. Gribs from PredictWind often don’t come in and their other services never.

    I am less than satisfied but I am happy to hear others are doing well with it. Perhaps it is my installation and problems with PredictWind.

  3. Hello Francis, happy new year to the fact. It must be called.
    Since this crossing, It was me the skipper ? One of more and still coming in 2 weeks. Should I say that I accumulate experiences ? Good for sun loungers I stopped counting, But back to GO.
    Since I'm not Croesus, I still hesitate. For someone who is not yet equipped, Let's just, There is no picture. I would even add that for a traveler you find yourself with minutes conventional satellites cheaper than minutes roaming via mobile operators, more reason to do not hesitate.
    For someone who already is team, It is less obvious, excluding cost of equipment therefore, I think that it will depend on the program, package GO offer, unless error is 1 month from the first to the first, so minimum for a sunbed 2 month see 3 as you say in your example. With a classic iridium, I just use a map 500′, 700 EUR, (701,28 HT), cheaper than what you ads, and with that I would like 1 years by reason of 6 up to 8 months of sea (minimum eh ?). And the second point, in voice, It is rather less good than the conventional iridium “What do you say .. I hear you more, Allo, Allo”. I'm exaggerating a little, but since I asked the question and you know my side geek. For first equipment Yes, without hesitation, thence to abandon the “old” Iridium, I have to say that I'm waiting for the new generation of satellites, high promised speeds and the list “Official” of what will be compatible.
    And before you have on the phone, a few words on this blog to wish you happy new year, It is not too late and again thank you for all your work.
    PS : I know that you will love, After Olivier, It is, in principle, Mark (SEAIq) that comes with me to my next transat … It'll still be a geek boat …me be a Cook.

  4. Hello
    I can't find the name of the operator to 169 euros monthly.
    Thanks for giving me his name and contact information.
    Good day

  5. Congratulations for your article.