Most VORs are being phased out as well, with only a minimum network left in place to support routing flights on instrument flight plans to airports with non-GPS

Most VORs are being phased out as well, with only a minimum network left in place to support routing flights on instrument flight plans to airports with non-GPS approaches (i.e., ILS) in the event of a GPS outage. [1]: https://www.aopa.org/advocacy/airports-and-airspace/navigation-and-charting/vor-minimum-operational-network https://www.aopa.org/advocacy/airports-and-airspace/navigati...