Inseego exists in high orbit, but is ludicrously slow and expensive.
ViaSat and related all exist in high orbit and are ludicrously slow and expensive, *and* typically require fixed installations.
Option three is "don't sail outside the range of cellular towers" which is... An option? Not a great one, but an option?
So anyway I take the good with the bad, and will hope for an eventual less impactful true-remote-places connectivity option to eventually surface.