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

“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!

Why do we expect this quantum map of gravity and magnetic fields to be permanent?

Why do you think they expect it to be permanent? We survey all kinds of stuff like this all the time.

Geography and celestial maps are permanent (mostly).

The next question is, how long until a quantum measured map becomes unrecognised? Is the half life years or hours?