I suppose a relatively easy way to get something similar is an app that tracks your movement and causes the phone to vibrate the more directly north you are mov

I suppose a relatively easy way to get something similar is an app that tracks your movement and causes the phone to vibrate the more directly north you are moving? Or perhaps different 'rhythms' depending on whether you're facing north or south. It's not quite the same, but it would be easy to make such an app and I suspect our brains will still be able to use the information as we get used to it. Not sure how it would impact battery life though...