The Air Force May Ditch GPS for Earth's Magnetic Field
We're long overdue for a new way to navigate.
By Kyle Mizokami
Aug 4, 2020
The Air Force, wary of losing its GPS satellites during a major war, is exploring alternatives.
One alternative is using a magnetic field map of Earth.
Maps of Earth’s magnetic field are very accurate, but we don't know how data is gained about possible enemy territory.
https://www.popularmechanics.com/military/research/a33512412/air-force-magnetic-field-gps/