How TIS-B is received
TIS-B traffic is broadcast on the 978 MHz frequency. Only Mode-C traffic detected by
surveillance radar within 15 nm and 3500’ of ADS-B Out equipped aircraft are transmitted via
TIS-B. Air-to-air ADS-B broadcasts are not a part of TIS-B.
Pilots using a Sentry receiver within the service volume of an ADS-B ground station will receive
TIS-B data for display in ForeFlight. When a traffic target is tapped, the traffic pop-up will
indicate whether the target is from an air-to-air broadcast (ADS-B) or the TIS-B broadcast.
Unlike traffic information received directly from ADS-B Out equipped aircraft, TIS-B traffic
targets often lack identifying information (tail number, call sign, Etc.).
ADS-B and TIS-B Differences
ADS-B traffic icons often include more information than a TIS-B traffic target. ADS-B Out traffic
targets generally display, at minimum, a registration number and relative altitude whereas TIS-
B targets only display the relative altitude. Tapping on each traffic symbol reveals information
about the target.
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