Lockheed Martin Dark Ice: a quantum magnetometer geopositioning system

Reading the article, it seems the real use case (unmentioned) is on ballistic missile nuclear subs.

You want them to be well below the surface of the water, where the GPS signal does not penetrate so well. Thus having a way for them to know precisely where they are without relying on GPS would be very helpful.

Neat. Geopositioning in general is a "hard problem" especially with additional variables/complexities that are introduced for specific use cases (military or not). There's tons of room for cutting edge research here still, and it's exciting to see companies invest in that.

Very interesting, and amazing technology. But… How is it unjammable? Couldn’t you just generate a big magnetic field?

(2019)