[prpl]

those are GPS based too. You typically would have a circuit you trained off off 1PPS and hopefully had a 10 or so satellites in view.

You can get 50ns with this. Of course, you would verify at NIST.

[metaphor]

> ...and hopefully had a 10 or so satellites in view.

I believe you'll need 12 GPS sats in view to gain incremental accuracy improvement over 8.

[YetAnotherNick]

GPS could be blocked easily, and AFAIK even given corrupted inputs. And HFT could possibly benefit from blocking or corrupting competitors GPS.

[johncolanduoni]

Deploying a GPS jammer in civilized territory is a great way to go to prison.