Lab 12: Part II - Garmin Handheld GPS Exercise

I. Objectives

• To become familiar with the use of the Garmin E-Trex receiver
• To get a physical feel for the accuracy of an individual measurement

II. Exercise

The accompanying maps show 13 points in the area of the circle drive, immediately east of the Jackson Geosciences Building. The table below gives the UTM NAD83, zone 14 location of the points, as determined with GIS software and a high-resolution, georeferenced DOQ. With your hand-held receiver:

1. Measure and record the UTM NAD83 coordinates of each of the points shown on the aerial photograph in the table below.
2. Plot each measurement on the map without the photograph and connect it with a line to the point showing its actual location.
3. Find and record the bearings (in azimuth) and distances (in meters) between the measured and actual locations and record them in the table below.
4. Turn in the table and the map showing the plotted measurements.
5. What is the average horizontal accuracy of your measurements?

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