##### Department of Mathematics,

University of California San Diego

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### Math 196 - Student Colloquium

## Nolan Wallach

#### UCSD, Department of Mathematics

## How does your GPS know where you are?

##### Abstract:

The Global Positioning System involves about 24 satellites orbiting the earth each sending a unique signal. Your GPS receiver receives the signal from at least 4 of them and from these signals it tells you where you are within 10 meters (if your GPS can handle WAAS the accuracy is 3 meters). The calculations done by your receiver involve general relativity, error correction and geometry.

### November 26, 2013

### 11:00 AM

### AP&M B402A

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