Positioning sensor (IMAGE) Virginia Tech Caption Positioning sensor located at the base of the Ol Doinyo Lengai (The Mountain of God), an active volcano in Tanzania. Credit Joshua R. Jones for Virginia Tech Usage Restrictions None License Licensed 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.