Figure 5-6. Next generation network enabled weather (NNEW) provides a common weather picture across the NAS.  Figure 5-7. National airspace voice switch (NVS) will replace  existing voice switching systems with single air/ground and ground/  ground voice communication systems.  Figure 5-8. ADS-B services provide real-time precise positioning capability to ATC and ADS-B In-e q uipped aircraft throughout the  NAS, in all phases of flight operations.  5-5 and ground/ground voice communications system.  [Figure 5-7]  The goal of NextGen is to provide new capabilities that  make air transportation safer and more reliable while  improving the capacity of the NAS and reducing aviation’s  impact on the environment. Below is a list of some of the  capabilities for operational use that have already been  implemented through NextGen.  NextGen Existing Improvements  1. Starting in December 2009, the FAA began controlling air traffic over the Gulf of Mexico, an area of active airspace where surveillance was never before possible, using the satellite-based technology of ADS-B. For aircraft flying over the Gulf of Mexico, where no radar coverage is available,  ATC can safely and more efficiently separate air traffic with the real-time visual representation of air  traffic provided by ADS-B. It also provides pilots with  34  Final approach/landing Flight planning  Push back  Domestic/oceanic cruise  T axi T akeoff  Descent 