That's cool, but I somehow have the feeling it's a click bait title. Reading the linked, it starts saying bla bla navigation bla bla gps free... And then quickly advance to the point of measurements of anomalies in magnetic fields and ore detection and underwater navigation through (existing) maps of magnetic fields. But, in my eyes, the main focus was clearly put on detection of minerals/ore and unexploded ordnance in soil in the very last paragraph.

otherwise, top news. Such device is indeed a very very useful in terms of searching of mines and bombs and minerals and such. And for sure might revolutionize the stupid detection devices for finding cables and pipes in buildings, finally.