You don't need much calculation power to manage a 30-min ballistic trajectory.

The inertial navigation system is the very crazy part, along with the nuclear fusion warhead design itself.

I was under the impression that the Trident II could do terminal phase maneuvering, so not a straight ballistic trajectory, but fair enough.

	▲	pinewurst 3 hours ago \| parent [-]
		It controls the fusing, not positioning. https://thebulletin.org/2017/03/how-us-nuclear-force-moderni...