Note that GPS receiver capable (i.e. not artificially limited) of providing navigation data while moving 600 m/s or higher used to be considered munition by ITAR. The amount of legalese at updated ruling [1] is well beyond what I can make sense of, to the point I don't even know if it still applies.

While we're at SDRs, ITAR is also responsible for takedown of passive radar GNU Radio module made by Kraken RF team.

[1] https://www.space.commerce.gov/itar-controls-on-gps-gnss-rec...