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
was available at 99.9% of the anchorages
that we used circumnavigating the North Atlantic.