*Cant be Non-magnetically hacked

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

If it works off tiny changes in gravity, a really big rock would work.

Our mission is to sneak this Ayers rock under the boat without being detected. In and out. 45 minutes tops.

I was going to say something about the scale of gravity changes needed, but your take is way better. Cheers.

Most people probably don’t know but we call it Uluru these days as that’s what the local Aboriginal people named it. Ayers Rock is the old coloniser name, and pretty out of fashion.

I know and I am sorry, but the joke would have gone over the head for most of the people if I had said Uluru.

And that rock? The moon.

Well, to be fair, a big rock would also work on a GPS device, if applied directly to it.

It’s a bit obvious that isn’t it. Hey captain there appears to be a ship with a giant boulder on board and it’s following us around, do you think that might be relevant?

Might as well just hit the ship with a really big rock at that rate

Ah time to make use of my massive tungsten cube

They just trigger degauss on 10,000 CRT monitors simultaneously.

Just sell initially fake map

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.

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

Don’t these fields fluctuate in some currently not understood way?

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

So you constantly need updated maps. Reminds me of celestial navigation where you always need an up-to-date almanac.

Hhhmmmm, sounds perfect for the subscription model…

But how do you get your position to update your map? Oh… GPS will work!

What? You just download a new map for the area you want to go to every year or so, no need for GPS

I’m not sure you got me. How do the map makers update the map? If the gravity variance changes so it can’t be used to determine your position then clearly you need some other way to determine your position to update the gravity map. And what might that be??

Using the same reference points on earth that GPS uses, that doesn’t mean using GPS.

That doesn’t work too well out in the ocean and lots of other places too. If you can’t use your gravity map, you’re gonna use GPS for precise position data.

Coordinate systems existed before GPS.

Not with GPS accuracy

So, like terrain-matching, but gravity field. Cool!

Two issues I have with the presentation:

A magnetic field is an external signal - the Earth’s magnetic field is actually incredibly weak…

10x better performance than GNSS … positioning accuracy of 1 nautical mile. Cheap old school handheld GPS out in the woods was accurate better than 10 feet most of the time, so what in this performance is 10x better? 10x more resistant to jamming? Seems like it should be completely impervious to jamming. 1 nm accuracy is useful, but hardly better performance.

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.

The realer play is submarines. You don’t get any satellite signal at all underwater. Before this it was only INS or dead reckoning.

I suspect submarines can also use bottom facing radar to track features on the sea floor. But tracking the gravity should be even better.

Radar doesn’t work underwater. Sonar does, though most subs want to be stealthier than constantly shouting downwards.

Radar is radio, just like most satellites. It doesn’t do well through water. And that would require emissions, which submarines like to avoid.

I’m guessing they meant sonar instead. AFAIK active sonar does work really well, but is rarely used since it reveals your location twice as far as you’re able to detect others. Not to mention the horrible effects on wildlife - the sound waves carry so much energy that a point-blank hit is somewhere between “lethal & untreatable” and “turned into red mist”.

Im pretty sure there were underwater beacons they used for aiding their navigation. Active or passive, man made or natural phenomena…

For those confused:

nm means Nautical mile here, not nano meter

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.

youtu.be/tz23G_UXCGA

I don’t recommend Veritassium anymore. It’s not the same channel it used to be. It was sold to a private equity group, and now makes garbage.

Here’s an article: arstechnica.com/…/tests-suggest-russian-satellite…

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

Yeah, I remember in the 1980s seeing a briefcase sized “laser gyro” INS system, it was definitely better than no INS, but just couldn’t hold a candle to GPS.

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?

I’m guessing remote sensing will be involved with keeping the maps accurate.

There’s literally whole projects to map out movements of continents and the change of the geoid shape of earth, although it takes a few years for it to matter in most cases

Unless there is volcanic activity, geography can be considered permanent within a lifetime. Given the accuracy this technology claims, I suspect the lifespan is very short lived.

djublonskopf.com/…/how-do-we-know-the-continents-…

Multiple centimeters per year isn’t nothing but it is enough to force recalibration within your lifetime, multiple times

You don’t use those kinds of sensors non-stop from one calibration. You recalibrate and update maps regularly. Then if you lose some sensors you can still read reckon with high enough precision for weeks

It is not permanent, but the changes are slow enough

It’s going to be missiles again isn’t it?

It always is.