• What is GPS?

    The Global Positioning System (GPS) is a location system based on a constellation of about 24 satellites orbiting the earth at altitudes of approximately 11,000 miles. GPS was developed by the United States Department of Defense (DOD), for its tremendous application as a military locating utility. The DOD's investment in GPS is immense. Billions and billions of dollars have been invested in creating this technology for military uses. However, over the past several years, GPS has proven to be a useful tool in non-military mapping applications as well.
    GPS satellites are orbited high enough to avoid the problems associated with land based systems, yet can provide accurate positioning 24 hours a day, anywhere in the world. Uncorrected positions determined from GPS satellite signals produce accuracies in the range of 50 to 100 meters. When using a technique called differential correction, users can get positions accurate to within 5 meters or less.
    Today, many industries are leveraging off the DOD's massive undertaking. As GPS units are becoming smaller and less expensive, there are an expanding number of applications for GPS. In transportation applications, GPS assists pilots and drivers in pinpointing their locations and avoiding collisions. Farmers can use GPS to guide equipment and control accurate distribution of fertilizers and other chemicals. Recreationally, GPS is used for providing accurate locations and as a navigation tool for hikers, hunters and boaters.
    Many would argue that GPS has found its greatest utility in the field of Geographic Information Systems (GIS). With some consideration for error, GPS can provide any point on earth with a unique address (its precise location). A GIS is basically a descriptive database of the earth (or a specific part of the earth). GPS tells you that you are at point X,Y,Z while GIS tells you that X,Y,Z is an oak tree, or a spot in a stream with a pH level of 5.4. GPS tells us the "where". GIS tells us the "what". GPS/GIS is reshaping the way we locate, organize, ****yze and map our resources.
    Comments 5 Comments
    1. photohiker's Avatar
      photohiker -
      Quote Originally Posted by Nicko View Post
      Nope, same problem as the home page:

      photohiker, you do not have permission to access this page. This could be due to one of several reasons:

      Your user account may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
      If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation
      Maybe you should make us all super moderators and let anarchy reign?
    1. Bushwanderer's Avatar
      Bushwanderer -
      Hi Nicko,
      It worked for me, although I did have to logon to reply. (Obviously, that worked this time.)
    1. Trev88's Avatar
      Trev88 -
      Nice to have some background of where GPS started, it’s amazing just how much comes out of defence world wide.
    1. johntkooz's Avatar
      johntkooz -
      superb post. would have liked a bit more info, but nice1.
    1. Nicko's Avatar
      Nicko -

      try above link for more