Looks like INMARSAT gobbled them up in December and I can’t find much about the service. A webpage exists for the system on the company site (http://www.globewireless.com/network/hf) but nothing actually directs to it from anywhere else, leading me to believe it’s now defunct. From the description there though, it seems pretty limited.
As far data delivery on ships outside of the GMDSS suite, my company mainly uses VSAT for data at sea, as well as FleetBroadband mainly for phones. Aside from (filtered, slow) internet access and email, we’re partly networked with the office on shore and are also required to have access to an online company system for use with a lot of day-to-day tasks. We have our own servers on board that run a lot of the internal stuff, and updates pushed from the office. (We’re pretty much at the edge of my knowledge about how any of this stuff works…) For us at least, I don’t think an HF system can cover our needs.