You're making claims which, whether intentional or not, serve to discount the usefulness of this technology. First of all, your claim is a stretch for a number of reasons, people don't always take the same route, people aren't always going to the same places, there are countless scenarios which would make it incredibly hard to find someone who'd had an accident even if you're incredibly familiar with their daily routines. It sounds like you're discounting the tech because you were responding to points about what makes the tech valuable. Saying "but you could probably just guess where they are" is a pretty pointless response. Sure, you could, or you could know exactly where they are and where to send help which is much better than going off a hunch which has a too high chance of being wrong when we're talking about an emergency scenario. If your entire point is that, it's sometimes possible to guess where people are, I guess.... great? It's also possible to guess and be wrong while they lie bleeding 2 miles in the other direction.