“Quantum sensors can sense the tiniest of changes in the gravity or magnetic field and use a previously prepared map of these properties to determine their location. Since a quantum sensor does not need to receive or send a signal to an external device, it cannot be hacked or be spoofed by a fake incoming signal either. “ Very cool!

The team achieved 10 times better performance than GNSS systems, with a one nautical mile of positioning accuracy.

Variation up to a full nautical mile doesn't seem very accurate?

Here is the paper

https://doi.org/10.48550/arXiv.2608.25563

And here is the easier to read press release from Q-CTRL with less errors and ad block black screens.

https://q-ctrl.com/blog/q-ctrl-achieves-worlds-first-gps-free-quantum-gravimetric-navigation-demonstration-in-maritime-field-trial

Navigation with a suitcase sized device that doesn't rely on hundreds of thousands of satellites? Honestly this sounds great.

The trouble with Quantum Navigation is you might end up where you were trying to go, but at a random point in the past where you have to change history to put right something that once went wrong.

Perfect for autonomous military robots.

Using quantum sensors, the company achieved ten times the accuracy of conventional satellite-based navigation systems, while maintaining the one nautical mile positioning accuracy.

Don't we use GPS accurate to within centimeters for construction?

The only significant word here is "quantum". This stuff is too expensive to be useful for anyone other than the military right now. Gravity maps are controlled information as well. Used for ballistic submarine missiles. The maps created by the military will never be made public. (It would look like a highway of where every vessel is or will be)The accuracy of satellite measurements is 3km, with physical topographic (sea/land) resolution at 1.2km. The long-term plan is to have these sensors traverse areas, record data, and then share it with a database. Even those maps are realistically only 300m~ in resolution. Compare that to GPS, which has a nominal resolution of 3m with 15 satellites, or about a foot, with a correction from ground relays. (I remember using a handheld device that would tell you how many you were connected to, and it stopped working once you were near a tree.) Gravimeters have been used by submarines since the 1980s.

https://en.wikipedia.org/wiki/Gravimetry