GPS Environmental Science

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GPS Environmental Science

• Chad W. Janowski
• Shawano Community High School

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GPS 101

• Global Positioning System
• 24 Satellites
• 5-8 overhead at any given time
• 3 Lat. Lon.
• 4 Lat., Lon., Alt.

Image courtesy U.S. Department of Defense
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Time Based Triangulation

• Distance Rate x Time
• GPS signals sent at speed of light
• Time is the difference between when the signal is
  sent and received

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Sources of Signal Interference
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GPS Receivers

• Handheld
• Recreational Use
• 3-15 meter accuracy
• Vehicular
• Fleet, Agriculture, Personal Use
• lt 1 meter accuracy
• Backpack or Tripod
• Surveyor Use
• 5-10 cm accuracy

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Uses of GPS

• Digital Compass
• Determine Ground Speed
• Store Locations
• Navigation
• Dynamic Routing
• Mapping/Surveying

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GPS Basics

• Waypoint Saved Geographic Location
• Track The Path Traveled
• Route Series of Waypoints

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Garmin eTrex
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Garmin eTrex Basics
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Garmin eTrex Basics

• eTrex Pages

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Garmin eTrex Basics

• Navigation Page

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Garmin eTrex Basics

• Menu Page

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Garmin eTrex Basics

• Mark Page
• Hint Press and hold enter any time to mark a
  location as a waypoint

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Garmin eTrex Basics

• Waypoint Page

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Garmin eTrex Basics

• Map Page