Quite interesting, to myself magnetic fields wouldn't seem all that accurate but then again it's known some animals can navigate back to the same spot each yearly nesting / migration. It did seem maybe as per the article and [1] [2] the concept was just a little bit too good to be true but [3] being military supports that they've been working towards an additional perhaps more accurate system.<p>[1] <a href="https://arxiv.org/abs/2504.08167" rel="nofollow">https://arxiv.org/abs/2504.08167</a> [Submitted on 10 Apr 2025 - Quantum-assured magnetic navigation achieves positioning accuracy better than a strategic-grade INS in airborne and ground-based field trials]<p>[2] <a href="https://q-ctrl.com/blog/q-ctrl-overcomes-gps-denial-with-quantum-sensing-achieves-quantum-advantage" rel="nofollow">https://q-ctrl.com/blog/q-ctrl-overcomes-gps-denial-with-qua...</a> [the company's blog]<p>[3] <a href="https://www.defence.gov.au/news-events/news/2024-09-25/battlefield-developments-their-sights" rel="nofollow">https://www.defence.gov.au/news-events/news/2024-09-25/battl...</a> [25 September 2024 Battlefield developments in their sights]
Hmm sounds like it's using something like a SQUID (<a href="https://en.m.wikipedia.org/wiki/SQUID" rel="nofollow">https://en.m.wikipedia.org/wiki/SQUID</a> ) but as far as I know they all need to be cooled with liquid nitrogen; would be cool if they've invented one that doesn't