Garmin GDL 88 User Guide - Page 11
Ads-b System Overview - datalink
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2 ADS-B SYSTEM OVERVIEW ADS-B is a core technology in the FAA Next Gen air traffic control system and is comprised of three segments: ADS-B (Broadcast), ADS-R (Rebroadcast), and TIS-B. Nearly 400 ADS-B ground stations were completed and operational by mid2012, with most of the rest - totaling more than 700 planned stations - expected to be operational by early 2014. The graphic below illustrates where ADS-B is currently operational. In the areas highlighted in blue, you can already start taking advantage of ADS-B's datalink traffic and subscription-free weather services if you're equipped with an ADS-B "In" solution. Figure 2-1 ADS-B Ground Stations (mid-2012) - FAA Illustration 190-01122-03 Rev. A GDL 88 ADS-B Transceiver Pilot's Guide 2-1