Have you ever come out of the subway running late for a meeting with no clue which way you're supposed to go? Sure, Maps will tell you how to get to your appointment, but only if it's aware of where you are and what direction you're facing. Sometimes it "thinks" it knows these, even though the data it's being fed is inaccurate. You're then in for some impromptu outdoor trivia: Try to figure out which path to follow by checking if the blue dot is moving in the same direction you're supposed to. If it's not, it probably means your compass is not calibrated, so you can start frenetically shaking your phone in an 8 shape to see if it'll eventually point the right way.

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