Comment by dr_dshiv

Not to mention the astroinertial guidance system on ICBM nuclear missiles.

To wit, there are 12 Ohio class submarines each with 20 trident missiles each carrying 12 maneuverable nuclear warheads (475 kilotons each).

The missiles are launched under water, reach Mach 18 in 2 minutes, and don’t need GPS — they use the stars to deliver their payload.

I saw a test missile launch once before. It still terrifies me.

https://en.wikipedia.org/wiki/Ohio-class_submarine