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In a worst case scenario: US Invasion. What device could the US government simply force to stop working in Canada that would cause the most chaos (e.g: brick all iPhones)? (lemmy.ca)

submitted 4 days ago by [email protected] to c/[email protected]

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What products are most at risk. What are easiest to replace to reduce risk? Hardest to replace?

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[–] [email protected] 20 points 4 days ago (2 children)

GPS. The system can be turned off in specific regions (no idea how, it's classified, but they've actually done it so it's not just a wild notion), and portions of the signal are already encrypted such that they're only available to the US military. There would be little stopping them from sending altered signals or just turning it off.

Many missile systems, aircraft and fighting vehicles rely on GPS to function as expected.

[–] [email protected] 12 points 4 days ago

This is a fair take. However, it does presuppose that we would have sufficient missile systems, aircraft, or fighting vehicles that it would matter.

I have a lot of GNSS units that allow you to choose which networks they're receiving (GPS, Glonass, Galileo, etc.). I've never tried to turn off GPS just to see -- might be interesting as an experiment.

[–] P00ptart 4 points 4 days ago (1 children)

They no longer add in inaccuracies to non-us military GPS units. That ended like 20 years ago?

[–] [email protected] 4 points 4 days ago

Oh, not inaccuracies. Just portions of the signal only available to the military. The original intent was to limit accuracy, and now it's more to counter spoofing, but it's still there, just upgraded.