It's not hardened, they have 2 synced systems effectively that can pick up from each other, such that, if there's a bitflip, it can restart and switch over in l

It's not hardened, they have 2 synced systems effectively that can pick up from each other, such that, if there's a bitflip, it can restart and switch over in less that the time it takes for a loop (kinda) so it can easily do this is mid-air with no loss of alititude or positioning.