To offset GPS vulnerabilities, the US Navy has continued to maintain skill with the traditional method of determining ship location at sea through celestial navigation. In addition, the Navy is installing modern inertial guidance devices that rely on laser gyros. In short, while there would be some problems in the scenario you described, they would not cripple the Navy’s ability to operate effectively and carry out its missions.
-—To offset GPS vulnerabilities, the US Navy has continued to maintain skill with the traditional method of determining ship location at sea through celestial navigation.-—
Yeah. The IJN would still be destroyed without ever getting close to the modern ship to counterattack.
It’d be a slaughter.