Draft AC 90-114A: Automatic Dependent Surveillance-Broadcast Operations

FAA has published a draft update to AC 90-114A: Automatic Dependent Surveillance-Broadcast Operations. It contains useful definitions and references for pilots who want to learn more about ADS-B.

ADS-B Advisory Services: Coverage Essentially Complete in Lower 48

According to the latest maps available from the FAA, the network of ground-based transmitters for ADS-B Broadcast Services (TIS-B and FIS-B) now provides coverage throughout the continental US.

Update: The FAA published a press release on April 14, 2014 announcing the completion of the ground infrastructure, which includes 634 radio stations.

The following diagram shows the locations of the operating transmitters as of late March 2014.

ADS-B-Map-March2014

And here’s a diagram that shows the coverage provided by the network. Note that these service volumes assume you are high enough to receive the broadcasts, typically at or above about 1,500 feet AGL, depending on your distance from a transmitter.

ADS-B-ServicesCoverage

Here’s an FAA video that describes ADS-B Broadcast Services.