> Today, ring-laser gyro INS systems with embedded GPS come in tiny packages and can sustain massive G forces allowing them to be packed into everything from mi

> Today, ring-laser gyro INS systems with embedded GPS come in tiny packages and can sustain massive G forces allowing them to be packed into everything from missiles to artillery shells...Before GPS was available to correct for drift, it's amazing the lengths engineers went through to make inertial navigation systems as accurate as possible. Having your nuclear deterrence depend on GPS staying operational seems...questionable.