On: Finnish govt agency warns of unusual aircraft GPS interference

[hericium]

Disrupting GPS may result in some economic chaos - it is used for precise time synchronization on financial markets.

[andylynch → hericium]

It would be annoying but far from chaos for a few reasons

- Its pretty easy to detect. Similar problems come up occasionally, often due to drivers jamming their companies’ remote monitoring.

- The time services in any well operated network will operate well within tolerance for very extended periods without this signal (some bigger ones don’t use GPS time at all for reasons like this) Time labs offer their own signals.

[nly → hericium]

Eh? Many exchanges don't offer timestamps beyond millisecond accuracy, which is easily achievable via NTP and atomic clocks on the ground.

Maybe some extreme HFTs doing arbitrage between markets

[RF_Savage → hericium]

GPS is an universally used timing source. For everything from SCADA to cellphone base stations to NTP Stratum-1 time servers.

It's easy, cheap and precise.