The Economic Times

In 2015, the US Naval Academy put celestial navigation back in the syllabus after dropping it in 1998; officers learn the sextant in case GPS is jammed or spoofed

In response to concerns over potential GPS failures, the US Navy has reintroduced celestial navigation training. This decision addresses vulnerabilities such as signal spoofing and interference that have affected navigation systems, notably in commercial aviation. Reports have highlighted instances of GPS disruptions in flights, prompting the Navy to acknowledge the necessity of backup navigation methods to ensure safety in an era heavily reliant on GPS technology.