You could probably determine that with some walking. In a building, there may only be a few places where a right turn makes sense 3m after a left, 2m after a r

You could probably determine that with some walking. In a building, there may only be a few places where a right turn makes sense 3m after a left, 2m after a right, etc. Or a Bluetooth beacon. I wonder if this could be useful on a phone, if a user held the phone steady and the accelerometers picked up the candence of their walk.