We used a Iridium 9555 for two years on a
docking station. We were able to download GRIBs and talk to
family anytime anyplace. I would recommend getting a subscription to XGATE
compression and file downloading
software.
I also recommend programing in
marine emergency phone numbers...US Coast Gaurd and MRCC Falmouth in the UK. They are then available with a couple clicks of a button. Have a waterproof bag available in case you need to take it with you into the life raft.
As a consequence of having the Iridium we never bothered with our brand new
SSB.
You will really only need your Iridium
offshore. WIFI was available at 99.9% of the
anchorages and
marinas that we used circumnavigating the North Atlantic.