Gathering Location Data with a GPS receiver

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Presentation transcript:

Gathering Location Data with a GPS receiver GPS units are combination radio receivers and automagic calculators. The units are tuned to receive time signals sent by a set of 24 satellites on orbit around Earth. By comparing the time it takes for signals from 4 or more of the satellites to reach the receiver, the unit calculates its position.

Visualization of 24 GPS satellites orbiting Earth Visualization of 24 GPS satellites orbiting Earth. Dynamic notation shows total number of satellites with clear line of sight to a point at 45° N on Earth. Public domain visualization generated by El Pak - available from Wikipedia Commons

1. Walk up to a tree and hold the GPS unit at the trunk. 3. You’ve recorded the location 2. Press and hold OK 4. Press OK again to dismiss the MARK screen then record the other tree data

From GPS unit

Observations and measurements

To retrieve your location data 1. Highlight “Waypoints” 4. Press OK to display waypoint 3. Use arrows to Choose “Nearest” 2. Press 5. Record your data 6. To view you next waypoint, press the Page button then arrow down

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