Hurricane Hunter (image) American Geophysical Union Caption An Air Force pilot performs a pre-flight inspection of a "Hurricane Hunter" aircraft. Similar aircraft have begun measuring GPS signals bouncing off the ocean surface to determine wind speed. Credit Manuel J. Martinez Usage Restrictions Attribution-NonCommercial 2.0 Generic 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.