It's 2026: we have more ways to defeat jamming, or make it irrelevant, at unit costs trivial for commercial and most private applications. 1) atomic clocks can be smaller than a closed fist and allow GPS to work with 3 satalites with ocassional drops to 2. 2) the same clocks can be used to filter out radio sources from the wrong direction. 3) star navigation (commercial is often above weather, most weather is clear in some IR bands) 4) Terain following (easy to store maps now) 5) Inertial. 6) magnetic

When combined it is very hard to break the position fix. I expect the issue with the system is it's a military tech. with all it's that'll associated legal problems. After all. it'd bypass most the protections built into GPS modules.