The Navy this week requested $61 million for fiscal year 2009 to develop experimental receivers ground troops can use for precision navigation via Iridium and Global Positioning System satellite signals. The money would fund a research program dubbed High-Integrity Global Positioning System, or HIGPS, according to Navy budget documents. The project, previously called "I-GPS" or "GPS Extension Program" in Defense Department budget documents and congressional language, was developed by Boeing as a means to increase GPS accuracy during vertical aircraft...
