Also worth noting that I was happily able to spend a couple of hours walking around Edinburgh to hatch a 10k egg. And I did walk at least 8k of that 10k before you mention tracking issues. xD I checked it later on Google, it was less than 10, but not too much. That was just walking home from work and then around a couple of extra blocks. Not 400k, no, but keep in mind that this isn't supposed to be something you do in a single day. If I had my phone out every day like I used to when Go was still fresh, I'm pretty sure I would have managed 400k over a month or two, which isn't shabby.