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You want them to be well below the surface of the water, where the GPS signal does not penetrate so well. Thus having a way for them to know precisely where they are without relying on GPS would be very helpful.
Earlier quoted context omitted.
Magnetic field drops off by an inverse-cubed law (as opposed to inverse-squared for RF). So it would be a lot more impractical to cover large volumes.
Thanks. I would still be curious to know how the strength of an artificial magnetic field at a range of say 10 km compares to the order of magnitude of local variations they are talking about in the earth’s magnetic field.
In any case it wouldn't be as portable and would make you rather easy to detect I would imagine, if you wanted to cover a large area.
Reading the article, it seems the real use case (unmentioned) is on ballistic missile nuclear subs. You want them to be well below the surface of the water, where the GPS signal does not penetrate so well. Thus having a way for them to know precisely where they are without relying on GPS would be very helpful.
Earlier quoted context omitted.
They also have made a very large and high tech scraping knife, to remove any jam. /Jk
Raspberry!