How does your phone know exactly where you are?
Playing Marco Polo or hide-and-seek by sound: a friend yells and you only know how FAR they are, not which direction — you need a second and third shout from different spots to pin them down. Also the "you are here" dot wobbling on a phone map in a parking lot.
Talk about it
- Guess first: how can something in space that can't see you still know where you are?
- If you only knew you were one mile from school, name three totally different places you could be standing.
- Why do you think your phone's blue dot drifts more between tall buildings than in an open park?