systems have advanced tremendously over the years. With the
removal of selective availability it is now possible to get
3m positional accuracy with the cheapest of receivers, suitable
for many GIS applications. GeoVision has experience with a
wide range of GPS data collection equipment, including Trimble,Leica,and Garmin.
understand more about GPS systems the following websites should
be of interest - NAVSTAR, GLONASS, GALILEO
more general GPS Information click here