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Comment by paganel | Hacker News Reader

> Because GPS is so much more accurate, it'll be hard to wean ships' crews from it.

The Russians have been really good as of late at jamming the GPS signals on the front-lines of Ukraine (see for example this recent piece [1] of news of them jamming the GPS targeting system of HIMARS rockets), so I guess that's what the British and the Atlanticists more generally are trying to defend against.

Granted, I do not know if it would be possible for the Russians (or the Chinese) to jam the GPS signal used by a ship that is sailing in the high seas, but the danger is there.

[1] https://edition.cnn.com/2023/05/05/politics/russia-jamming-h...

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Longer term there is danger that adversaries will simply shoot down GPS satellites instead of jamming them. Current anti-satellite weapons can only hit targets in LEO but I'm sure that Russia and China are researching ways to target higher orbits.

Yeah, I was about to mention that, too. Hopefully today's navy guys still get trained to navigate the good, old classical way, without GPS. They could also do without necessarily having to rely on radio transmissions, as a back-up, of course [1]. That goes for the entire Armed forces.

> In a preemptive strike, Red launched a massive salvo of cruise missiles that overwhelmed the Blue forces' electronic sensors and destroyed sixteen warships (...)

> Van Riper used motorcycle messengers to transmit orders to front-line troops and World-War-II-style light signals to launch airplanes without radio communications.

[1] https://en.wikipedia.org/wiki/Millennium_Challenge_2002

Yes, the US Navy has resumed celestial navigation training.

https://www.npr.org/2016/02/22/467210492/u-s-navy-brings-bac...

A series of embarrassing navigational incidents may have something to do with it:

https://en.wikipedia.org/wiki/USS_Fitzgerald_and_MV_ACX_Crys...

https://en.wikipedia.org/wiki/USS_John_S._McCain_and_Alnic_M...

https://www.theregister.com/2021/09/21/hms_severn_fleet_navi...

> The FNO course takes naval officers who have passed the navy's first-stage navigation qualification, Preliminary Navigating Officer, and qualifies those people to navigate larger ships of frigate/destroyer size. It also teaches them to do it in the absence of GPS, falling back on age-old skills that would have been familiar to sailors in the early 20th century.

If one country can put a satellite somewhere, another country can readily put a bomb there. It is especially easy if the satellite is continually broadcasting its position.

Related: Perun just released a video on Anti Satellite Weapons. https://www.youtube.com/watch?v=-xl0C6K2Nug

The US and EU are looking into backups for GPS. For short-range, can use GPS-like beacons. This will work well for airports and close to cities. It is probably worth doing for increased accuracy.

There is talk of reviving eLoran which is enhancement of Loran long-range navigation. But countries keep shutting down transmitters because of lack of use.

Finally, it might be possible to use other satellite constellations for navigation. In particular, it sounds like Iridium provides timing information. In the worst, could add something the big constellations like Starlink.

If GPS is jammed, a device should then automatically try to use GLONASS and/or BeiDou in the expectation that the Russians and Chinese (respectively) would not jam their own systems. Perhaps simultaneous polling of all three is workable to avoid jamming as much as possible.

Jamming can be pretty directinal/targeted, and it's not that hard to imagine a situation where one side of a conflict would see it as a huge tactical advantage, even if it means both sides losing GNSS capabilities in some area.

That's the point where we go dark and pull out old tools that can't be intercepted (as with parent article). They'll waste time and energy developing and moving around GPS jammers to defend against smart weaponry, when the real threat changes to someone sneaking up on them and throwing dumb rocks. Slav logic amounts to Ewok warfare :)

China I'm unsure of, but Russia would absolutely jam their own systems to poke an adversary in the eye. America never would because corporate interests rely on Navstar; Communist regimes do not share our values or rules.

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