Today, October 23, we are celebrating the International GNSS day. This day is a celebration of the contribution of Global Navigation Satellite Systems and their importance in the modern world. The date 10.23 was chosen for its similarity to the fundamental GPS frequency of 10.23 MHz from which many other frequencies and quantities are derived (1023 MHz, 1023 chips) and which was adopted by other GNSS service providers.
The link below contains educational materials on the principles of global positioning done by the Institute of Navigation (ION).
https://www.ion.org/news/internationalgnssday.cfm
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