Data was collected during 1996-1998 as part of the Enhanced 911 data development project. Site coordinates were captured at each location requiring a new address, or for grandfathered towns that requested GPS work. The primary objective of the GPS data collection system was capture of site coordinates and various site information. In addition to the typical sub-meter GPS systems for capture of coordinate data, the data collection system utilized a "dead-reckoning" system that enhanced the GPS data by providing coordinate and heading data during periods of poor GPS reception. The coordinate location of each site was determined from a differentially corrected, 45-second (45 GPS points) average at each site, the vehicle heading, the heading to the site relative to the data capture vehicle and the range to the site. Range was determined from either a laser range finder or optical range finder. Both were accurate to within 5-feet over a 200 yard range. RF 5000 scale orthophotography was used for sites not accessible in the field. Sites added during the "interim" maintenance period between October 1997 and December 1998 were "screen digitized". These will eventually be GPS by an E911 maintenance contractor.