This is the seventh in a series of articles looking at the impact of NextGen on GA pilots.
Last post we discussed where GPS came from and how its implementation was successfully completed by using ground base pseudolites.
We also reviewed how triangulation was used for navigation. Triangulation basically emulates what we in aviation have used for years with VORs and ADFs. Pick two or more transmitters, home in on their intersection and, boom, you found your location.
Now we will home in on GPS a bit more and begin to see what role GPS will play in the Next Generation Air Transportation System (NextGen) and Automatic Dependent Survelliance-Broadcast (ADS-B), the cornerstone of NextGen.