Table of Contents
Advertisement
APPENDIX E
Garmin is not responsible for Mode S geographical coverage. Operation of the ground stations
WARNING:
is the responsibility of the FAA. Refer to the AIM for a Terminal Mode S radar site map.
TIS information is collected during a single radar sweep. Collected information is then sent through the Mode
S uplink on the next radar sweep. Because of this, the surveillance information is approximately five seconds old.
TIS ground station tracking software uses prediction algorithms to compensate for this delay. These algorithms
use track history data to calculate expected intruder positions consistent with the time of display. Occasionally,
aircraft maneuvering may cause variations in this calculation and create slight errors on the Traffic Map Page which
affect relative bearing information and the target track vector and may delay display of the intruder information.
However, intruder distance and altitude typically remain relatively accurate and may be used to assist in spotting
traffic. The following errors are common examples:
• When the client or intruder aircraft maneuvers excessively or abruptly, the tracking algorithm may report
incorrect horizontal position until the maneuvering aircraft stabilizes.
• When a rapidly closing intruder is on a course that intercepts the client aircraft course at a shallow angle
(either overtaking or head-on) and either aircraft abruptly changes course within 0.25 nm, TIS may display the
intruder aircraft on the incorrect side of the client aircraft.
These are rare occurrences and are typically resolved within a few radar sweeps once the client/intruder aircraft
course stabilizes.
Pilots using TIS can provide valuable assistance in the correction of malfunctions by reporting observations
of undesirable performance. Reports should identify the time of observation, location, type and identity of the
aircraft, and describe the condition observed. Reports should also include the type of transponder and transponder
software version. Since TIS performance is monitored by maintenance personnel, not ATC, malfunctions should
be reported in the following ways:
• By telephone to the nearest Flight Service Station (FSS) facility
• By FAA Form 8000-7, Safety Improvement Report (postage-paid card can be obtained at FAA FSSs, General
Aviation District Offices, Flight Standards District Offices, and General Aviation Fixed Base Operators)
514
Garmin G1000 Pilot's Guide for the Diamond DA40/40F
190-00592-06 Rev. A
Advertisement
Table of Contents
