Mine's in me bum. Always felt a squidgy tyre - and mostly the back one after the front has kicked something up, and the back has landed on it. However, a rapidly deflating front will bring you down fast. Only had it once, and that on the Road Rocket. Neither natural senses nor TPMS would have got that one.
But GPS? No ta. I like my maps and stopping to peruse. Even getting lost can be fun, and it gets you talking to locals. But for business it must be useful.