Garmin Appliance Data User's Guide Page 52

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40 190-00607-02 Rev D
Detailed Operation
ADS-B Traffic
Only transponder-equipped targets (i.e., Mode A/C
or Mode S transponders) are detected. Current radar
siting may result in limited radar surveillance coverage
at lower altitudes near some general aviation airports,
with subsequently limited TIS-B Service volume cover-
age. If there is no radar coverage in a given area, then
there will be no TIS-B coverage in that area.
TIS-B Limitations
1. TIS-B is NOT intended to be used as a
collision avoidance system and does not
relieve the pilot’s responsibility to “see
and avoid” other aircraft. TIS-B shall not
be used for avoidance maneuvers during
times when there is no visual contact
with the aircraft. TIS-B is intended only
to assist in the visual acquisition of other
aircraft. No avoidance maneuvers are
provided for, nor authorized, as a direct
result of a TIS-B target being displayed
in the cockpit.
2. While TIS-B is a useful aid to visual traffic avoid-
ance, its inherent system limitations must be
understood to ensure proper use.
(a) A pilot may receive an intermittent TIS-B
target of their own aircraft, typically when
maneuvering (e.g., climbing turn) due to the
radar not tracking the aircraft as quickly as
ADS-B.
(b) The ADS-B-to-radar association process
within the ground system may at times have
difficulty correlating an ADS-B report with
corresponding radar returns from the same
aircraft. When this happens the pilot will see
duplicate traffic symbols (i.e., “TIS-B shad-
ows”) on the cockpit display.
(c) Updates of TIS-B traffic reports will occur
less often than ADS-B traffic updates. (TIS-B
position updates will occur approximately once
every 3-13 seconds depending on the radar
coverage. In comparison, the update rate for
ADS-B is nominally once per second).
(d) The TIS-B system only detects and
uplinks data pertaining to transponder
equipped aircraft. Aircraft without a
transponder will not be displayed as a
TIS-B target. Always assume that there
are more aircraft in the vicinity of your
aircraft.
(e) There is no indication provided when any
aircraft is operating inside (or outside) the
TIS-B Service Volume, therefore it is difficult to
know if one is receiving uplinked TIS-B traffic
information. Assume that not all aircraft are
displayed as TIS-B targets.
3. Pilots and operators are reminded that
the airborne equipment that displays
TIS-B targets is for pilot situational
awareness only and is not approved as
a collision avoidance tool. Unless there
is an immediate emergency requiring
immediate action, any deviation from
an air traffic control clearance based
on TIS-B displayed cockpit information
must be approved by the controlling ATC
facility prior to commencing the maneu-
ver. Uncoordinated deviations may place
an aircraft in close proximity to other
aircraft under ATC control not seen on
the airborne equipment, and may result
in a pilot deviation.
4. Traffic Alerting is only provided for target
aircraft that report an integrity value (or
containment radius) of less than 1.0 nautical
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