False Traffic Alerts
If Sentry detects your aircraft’s ADS-B Out equipment and the information does not match
Sentry’s GPS, your aircraft will appear as a traffic target. Ownship status can not be assigned
to an aircraft if GPS data does not match. If ownship is not assigned to your aircraft, your
aircraft may generate false traffic alerts if detected.
False traffic alerts are most likely to occur with rapid maneuvering or poor GPS accuracy. If this
occurs, ownship status is lost and your aircraft will appear as a traffic target on the map. Once
position data matches, ownship correlation is established. If ownship is not assigned for the
entire flight, airframe interference or an issue with the aircraft’s configuration or position
reporting may exist.
If your aircraft is not equipped with ADS-B Out equipment, that does not exclude you from
being able to determine ownship. If your aircraft is broadcast via TIS-B (as a result of being
within 15 nm and 3500’ of an ADS-B Out equipped aircraft) and Sentry receives the TIS-B
traffic target, ForeFlight may be able to determine ownship.
Detecting your aircraft’s TIS-B target often causes your aircraft to appear slightly behind and
+/- 200' from your actual position. After a short period of time, ForeFlight will recognize the TIS-
B target as your aircraft and will assign it ownship status. Once assigned, the TIS-B target will
be suppressed. If ForeFlight is unable to determine ownship and your TIS-B target is detected,
there is no way to remove your TIS-B target from the map other than by turning off the Traffic
layer.
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