Overcoming GPS-Challenged Environments (IMAGE) U.S. Army Research Laboratory Caption U.S. Army Research Laboratory scientists Dr. Fikadu Dagefu (left) and Gunjan Verma (right) pose with one of the robots used to validate a new algorithm they developed, which enables localization of humans and robots indoors or in areas with many obstacles where GPS signals are likely to be unavailable. Credit US Army Photo by Jhi Scott 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.