@03ee4b50 NTP reference: https://endruntechnologies.com/products/ntp-time-servers/stratum1#:~:text=The%20basic%20definition%20of%20a,server%20OVER%20A%20NETWORK%20PATH.
@03ee4b50 See also sector breakdown in slide 9 here: https://www.gps.gov/governance/advisory/meetings/2019-11/gallaher.pdf