A developmental version of the TIS-B is now available from operational ground stations. TIS-B traffic consists of transponder equipped aircraft being seen by radar and then relayed to your aircraft via the Universal Access Transceiver (UAT) ADS-B data link. In order to see the transponder traffic, the aircraft must be within radar coverage and you must be within the communication range of a ground station.
You may receive an intermittent TIS-B target of your aircraft, typically when you are maneuvering (e.g., climbing turn) - due to the radar not tracking you as quickly as ADS-B does.
A TIS-B target of your aircraft will tend to lag behind your current position/altitude, but may be positioned anywhere around your aircraft's position.
The TIS-B position update is approx 3-13 seconds depending on the radar coverage in which you are flying. The update rate for ADS-B is approximately every second.
The TIS-B system currently only sees transponder equipped aircraft.
No transponder = no TIS-B target. Always look outside.
Pilots flying in visual meteorological conditions (VMC) are reminded that visual contact remains the only means of self separation. There is currently no indication provided when you are operating inside (or outside) the TIS-B Service Volume, therefore it is difficult know when you should be receiving all traffic information – assume you are not.
All pilots/operators are reminded that the airborne equipment that displays other ADS-B equipped aircraft and transponder equipped aircraft via TIS-B is only for pilot situational awareness. This equipment is not approved as a collision avoidance tool. Any deviation from an air traffic control clearance based on cockpit information must be approved by the controlling ATC facility prior to commencing the maneuver. Uncoordinated deviations may place an aircraft in close proximity to other aircraft under ATC control not seen on the airborne equipment and may possibly result in the issuance of a pilot deviation.