As long as GPS stays bullet proof, Navies are in good shape.
It's going to be a hard come-to-Beevis moment if the magic signal goes away and people have to remember celestial navigation.
Not sure you can even find a sextant on most vessels.
So too these AI services.
The Navy was phasing out celestial navigation, but after some public outrage from retired naval officers they brought it back.
GPS service is obviously going to go down whenever World War III goes hot, so the Navy is definitely training sailors on the alternatives.