Your goal with this research project is to develop a technique for GPS to find somebody’s position, including their elevation. If you have not read “Trilateration: How GPS Works,” it is recommended you do so before attempting this. Also, check out the Resources page to download Geogebra if you have not already. The 3D graphing tool will be a powerful assistant for this task.

For this activity, it is helpful to know the standard equation for a sphere, where (a, b, c) is the center of the sphere and r is the radius:

- Consider the following spheres and find out what shape is formed by their intersection:
- Based on your answer to question 1, how many spheres do you think you will need to locate someone in three dimensional space?
- In three dimensions, you are given the following information about three stations and your distance from them. Find your location:
- Here is the location of a fourth station. Can you determine your location now?
- Assuming the elevation of points A, B, and C are 0, it is proposed that the following formulas will find the coordinates of the point of interest: Prove/disprove this and check it with your work from problem 3.
- Conveniently, in question 3, I gave you three stations that were all at an elevation of zero. How would you deal with the situation where I gave you the following:
- Is it possible to adjust the formulas from problem 5 to work for problem 6? If not, can you propose a different strategy that quickly comes up with the coordinates of the point of interest.

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