Garmin GNS 530 Pilot's Manual And Reference page 219

radar antenna, the signal may be temporarily interrupted.
TIS is unavailable at low altitudes in many areas
of the U.S., particularly in mountainous regions.
Also, when flying near the 'floor' of radar cov-
erage in a particular area, intruders below the
client aircraft may not be detected by TIS.
TIS information is collected one radar scan prior to
the scan during which the uplink occurs. Therefore, the
the TIS ground station uses a predictive algorithm in
its tracking software. This algorithm uses track history
consistent with the time of display in the cockpit.
to induce errors in the GNS 530 display. These errors
primarily affect relative bearing information and traffic
remain relatively accurate and may be used to assist in
these errors follow:
that crosses the client aircraft course at a shallow
TIS may display the intruder on the wrong side of
the client.
190-00181-00 Rev. G
The preceding errors are relatively rare occurrences
and are corrected in a few radar scans once the course has
correction of malfunctions by reporting their observations
of undesirable performance.
Reporters should identify:
Since TIS performance is monitored by maintenance
be reported in the following ways:
GNS 530(A) Pilot's Guide and Reference
ADDITIONAL FEATURES
use
By telephone to the nearest Flight Service Station
Report, a postage-paid card designed for this
SECTION 14
14-3