I first had one over 30 years ago from a guy selling fruit from the back of his pickup truck at a campground I was staying at. It was the most amazing watermelon I've ever eaten.
Ok, so tell me how you are going to get a location fix underwater, in the dark, with no landmarks to orient yourself, in constantly shifting currents?
Even the Navy's most advanced nuclear submarines have to surface to get their location. This thing was a carbon fiber tube with an Xbox controller and an idiot designer.
They will target just enough minority citizens that they have plausible deniability that it's an "accident", but just enough of them to make them all afraid to show up at polling places.
And now so do you! That's how caching works.