Preparation (IMAGE) DOE/Sandia National Laboratories Caption Sandia National Laboratories intern Will Barrett prepares the payload for launch. The payload records GPS and non-GPS signals. After the flight, researchers compare their calculations from non-GPS signals to the actual positions. Credit Craig Fritz, Sandia National Laboratories Usage Restrictions For news-reporting purposes only. All other uses must receive express permission from Sandia National Laboratories. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.