Cue magnetic mines, but where are you getting the gravitic mines from?

You don't need to hack the quantum sensor. You'll hack the regular computer around the sensor.

I don't think it's realistically possible to do that totally undetected. Since the earth's magnetic field is so weak and field strength goes down rapidly as distance increases, malicious actors probably couldn't spoof patterns well enough to make the data look real, at least not without coming very close and staying near their target.

Yes, constantly. The prepared map becomes less accurate over time.

It always is.

For those confused:

nm means Nautical mile here, not nano meter

Its better performance than existing non-gps systems - not better than GPS. For ships , being within 1nm after thousands of miles of travel is really well performing. Obvious the real play here is weaponry though, since GPS isnt reliable in warfare and on-board sensors can do the detail work of target identification once in an area, the hard part is a way for them to self navigate accurately over long distances without GPS.

GPS is vulnerable to various attacks.

It's unclear what the capabilities are, but there IS a Russian satellite that HAS jammed GPS for almost a whole hemisphere. It's operated several times for a couple seconds over these past few years.

Veritassium did a great presentation on how we know this.

https://youtu.be/tz23G_UXCGA

I think it's an error in the article, they meant 10x better than classical INS.

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

It is not permanent, but the changes are slow enough