SUMMARY: The Department of Transportation, through the Office of the Assistant Secretary for Research and Technology (OST–R), will begin testing Global Positioning System/Global Navigation Satellite System (‘‘GPS/GNSS’’) receivers this April pursuant to the DOT Adjacent Band Compatibility Study (‘‘the Study’’) test plan published with this notice. Device testing will take place at the U.S. Army Research Laboratory at the White Sands Missile Range (WSMR) facility in New Mexico.