[Myrddin]

Accuracy is to a 100 ft grid point. The jammers won't help much as the missile will have selected final trajectory for each warhead well before they get near the "Pole 21" devices. It's propaganda to placate the masses. It might be an issue for a surface skimming Tomahawk, but even that has alternatives for fallback.

[FreedomPoster]

Intertial navigation, how does it work!?

https://en.wikipedia.org/wiki/Inertial_navigation_system