About the Author
Elliott Kaplan is a principal engineer at the MITRE Corporation, Bedford, Massachusetts. He is the New England Section Officer of the Institute of Navigation.. He earned his M.S. in electrical engineering from Northeastern University. Christopher Hegarty is a senior principal engineer at the MITRE Corporation, Bedford, MA. He received a D.Sc. in electrical engineering from The George Washington University and currently serves as editor of the Institute of Navigation's quarterly journal, NAVIGATION, and as a member of RTCA, Inc.'s Program Management Committee.