Michael L. Whitehead (MW), chief scientist at Hemisphere GPS, leads a team of engineers designing applications in machine control, guidance, marine, and survey. Managing Editor Tracy Cozzens (TC) spoke with him on June 4.More>>

French researchers devised and tested three differential GPS (DGPS) systems — standard DGPS, phase-smoothed DGPS, and a new wide-area code and phase differential system using a virtual base station.More>>

A new system integrating GPS, inertial navigation, and a high-speed digital camera fulfills transportation agency needs for precise surveying of highway center and edge lines, while slashing costs and production time — and increasing crew safety. The mobile mapping system, currently van-mounted...More>>