Where is it and how do I get there A comparison of the navigational accuracy of different levels of

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Where is it and how do I get there? A
comparison of the navigational accuracy of
different levels of GPS units

• Daniel Anderson
• NREM 446/546

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Objectives

• Test the relative effectiveness of different
  levels of GPS units when navigating to a point
• Compare the accuracy of each unit with no
  correction and with real-time correction
• Compare the price of each unit

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Materials

• GPS Units - Garmin Rino 110 Trimble Geo
  3 Trimble Geo XT Trimble Pathfinder
  Pro XT
• Marking Flags
• Meter Tape Measure

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• Two established points on Central Campus

Waypoint 2
Waypoint 1
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Methods

• Locate the two Central Campus waypoints using the
  GPS units navigation screen

Waypoint 1
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• Locate each waypoint with and without real-time
  correction
• Mark location for each GPS unit
• Measure distance from Waypoint to mark
• Each Waypoint located at three different times
  430pm, 830pm, 630am

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Results

• Waypoint 1

- Root Mean Square Error in meters
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• Waypoint 1

Rino 110
Geo 3
Geo XT
Pro XT
Uncorrected Positions
Real-Time Corrected Positions
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• Waypoint 2

- Root Mean Square Error in meters
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• Waypoint 2

Rino 110
Geo 3
Geo XT
Pro XT
Uncorrected Positions
Real-Time Corrected Positions
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RMSE for all measured distances
- Root Mean Square Error in meters
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• Possibility of a distance error 2 meters

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Price of GPS Units
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Summary

• Navigating to a point
• No significant difference between the Geo 3 and
  Geo XT models even when real-time correction
  enabled for the Geo XT
• Rino 110 2 - 3 time more accurate with real-time
  correction enabled
• Pro XT model significantly more accurate than
  other models

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• Ease of use
• Rino 110 overall easiest to use
• Trimble Pro XT best navigation screen but most
  awkward overall
• Geo 3 efficient but least user friendly

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Questions?