theoretically, great, and I would be shocked if they did not release a product functionally equivalent to the iridium and inmarsat aviation and maritime terminals, because of how much potential revenue is there. it will also be much better and faster than a multi-axis motorized tracking geostationary maritime terminal ($40,000+ things you can find in radomes on large ships, operating in various ku and ka band networks). there has been no official announcement on that sort of thing yet.
the current terminal has motion sensors in it and is not designed for a moving vehicle, it will turn itself off. the same 6-axis sensors that are used to orient and tilt it to the proper angle can also tell it when it's being moved.
Except then this thing were they assign you to a single cell and the vessel may pass the boundaries of said cell? Do you expect some sort of protocol for automatic handoff to the next cell in the future?
The service has been demonstrated on fighter jets so a boat at anchor should be no problem. Of course the $500 antenna they currently sell probably isn't quite as capable as the one they used on that fighter jet...
the current terminal has motion sensors in it and is not designed for a moving vehicle, it will turn itself off. the same 6-axis sensors that are used to orient and tilt it to the proper angle can also tell it when it's being moved.