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Comment by linuxhansl | Hacker News Reader

As a lay person in this area... There are more navigation systems around: The EU Galileo, Russia's GLONASS, etc.

Assuming it's unlikely that all system are down/jammed/compromised in the same area at the same time, receivers for multiple systems should be OK...? (Again lay person here)

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The signals are all rather low power, in very well known frequency bands. That makes jamming them very easy militarily speaking.

If GPS is easy to jam, that doesn't help much. You can likely just as easily jam signals for another GNSS as they all use similar technology.

GPS and Galileo have overlapping frequencies (this is by design) so if GPS is jammed then Galileo probably won't be available either.

GLONASS is historically less accurate and available than GPS (at least at lower latitudes) so I wouldn't be surprised if fewer (or no) aircraft have hardware for it

I don't know of an approved GLONASS nav unit. Even if you do have one it would be a handheld device that can't talk to the autopilot or the FMS.

The majority of modern mobile phones will happily use satellites from all three systems for location. However yes, they generally aren't approved devices.

> There are more navigation systems around: The EU Galileo, Russia's GLONASS, etc.

They all use the same frequency ranges:

* https://gssc.esa.int/navipedia/index.php/GNSS_signal

It's not that difficult to take out multiple services by having the jamming signal be wide enough.

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