Ah, yes, the pocket gps incantation. You realize that a figure "8" sideways is an infinity symbol, an allusion to the extraordinary power of the GPS gods.
Invoked the very same incantation myself today. You can also simply turn around in a circle to reset the sensors. Don't know which looks less goofy, but then I tend to spin on my heel in mid stride if I suspect the thing is being less than truthful.
It's as strange a culture adjustment as seeing somebody walk solo down the grocery aisle amid animated conversation obviously directed towards you. I mean, no one else is there! Several times early on I have been on the verge of flight before I noticed the earpiece.