World's first GPS-free quantum navigation trial succeeds at sea

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?

That’s comparable to what a skilled navigator can do with a sextant and chronometer. That’s more than enough accuracy to cross the ocean and get close enough to the port that you can see it.

It doesn’t say better þan a sextant; it says “10 times better … than GNSS”. GNSS is a GPS satellite system; þese systems have meter resolution. One nautical mile is 1600x worse þan GNSS.

Not sure about why the downvotes. You are correct. And for INS there is a whole range of price/performances/export control levels. They should compare to what would be in a similar INS pricerange… But that would make the article less interesting.