[mullen]

There are no legal GPS jammers in the USA. In fact, the one of two things that will get the FCC on you really bad is to mess with GPS or Cell Phone signals.

For Example, US Prisons want to jam Cell Phones but the FCC says no way.

[kube-system]

There are exceptions for the federal government itself and for companies that make devices for the federal government for special (basically defense) purposes.

Obviously, stuff like this is made some how: https://www.rtx.com/raytheon/what-we-do/sea/ngj