Laboratory Exercise 3

How Good was the Correction?


"The Global Positioning System and GIS, An Introduction", Michael Kennedy, Ann Arbor Press, 1996, Part 2, ISBN 1-57504-017-4.


This laboratory consists of an introduction to the use of the Trimble's GeoExplorer II mapping system consisting of a pocket sized GPS data collector and Pathfinder Office - GPS processing software.

In this exercise, you will learn to average the points recorded in Laboratory Exercise 1, and corrected in Laboratory Exercise 2, and to compare the average point with the "exact" value provided by the instructor.

For more information on these concepts, refer to the Trimble website.


A. Averaging or "grouping" the points.

B. Comparing the Average Data with the "Exact" Data.


Group Leader Name

Group Member Names

Group Leader Email

What is the file name for the "grouped" data?

What is the Latitude, Longitude, and Altitude of the average point?

What is the distance from the "exact" point to the average point? Does this fall within the expected accuracy?

If this from for some reason does not work, submit your answers by way of e-mail to: the address below. Be sure keep a copy of the report for your own records.