The National Geodetic Survey (NGS) has begun a research and development project in the Rocky Mountains of Colorado. NGS has contracted with Mountain Surveying and Mapping to use the Global Positioning System (GPS) to determine positions and elevation of survey marks along 73 miles of Interstate Highway 70, from Golden to Vail Pass. These marks were surveyed last year using more conventional spirit leveling techniques. After the new data are collected, the elevations from the new project will be compared to those from last year's work. The analysis of the data will help NGS improve survey techniques in mountainous regions. For more information, please contact Joe.Evjen.