1. Trevor Thompson, Ashley Crooks, Justin Benavidez

2. 34.55164, -101.17648 34.49840, -101.64545 34.55593, -101.73444

3. 1700s to 1900s-Sailors and travelers use compass’ and sextant’s to determine location 1938-Rabi develops the Atomic Clock 1964-First Transit satellite was launched 1964-Polaris submersible uses Transit to determine location 1967-First Transit unit produced for the public 1989-Government launches first of 24 satellites for military purposes June 26, 1993-Government releases GPS information and commercial production began

4. Prs + T + Es =  (x-x s ) 2 + (y-y s ) 2 + (z-z s ) 2 x, y, z are the positions we are trying to locate T = the time error at the receiver x s, y s, z s are the satellite positions (calculated Es = a sum of all the modeling errors considered by the GPS Prs is the approximate (pseudo-range) distance from the satellite to the ground (include tropospheric and ionospheric errors, clock errors from the satellite and any other error the GPS receivers thinks is significant enough to model)

5. We begin by measuring the distance to one satellite: We measure the distance from the 2 nd satellite to be 12,000 miles: We begin by measuring the distance to the third satellite to be 13,000:

7. Map out farms and important features Measure distance, altitudes, and area Map out a trip