45Detailed OperationTIS-A TrafficOperate/StandbyThe GMX 200, when installed with a control wireto the GTX 330, controls the TIS-A sensor operatingmode. The TIS-A sensor defaults to “Operate” whenturned on.Symbology• TIS-A targets are categorized as either “Proxi-mate Traffic” or “Traffic Advisories.”• Proximate Traffic targets are depicted ashollow blue diamonds.• Traffic Advisory targets are depicted as solidyellow/amber circles.• Vectors extending from the targets indicate thetarget’s direction of travel as reported by theTIS-A sensor. The vector length has no mean-ing.Ownship (Your Aircraft)Proximate traffic target with direction offlight vector and relative altitudeTraffic advisory target with direction offlight vector and relative altitudeTraffic Status IndicatorsThe following status indicators are displayed in thelower right portion of the display:“TIS Operating” to indicate the TIS-A Sensor isoperating and within TIS-A service coverage.“TIS Coasting” to indicate that the target informa-tion is between 6 and 12 seconds old. This may happenif the TIS-A sensor has missed a radar sweep. Targetbrightness is also reduced to indicate this condition.“TIS Unavailable” to indicate the TIS-A sensor isoperating, but outside of TIS-A service coverage.“TIS Standby” to indicate the TIS-A sensor is instandby mode and not processing TIS-A information,even if it is available.“Traffic Off Scale,” noted in amber in the lowercenter of the display, indicates that traffic has beenreported but is not displayed because it is beyond thecurrent map scale (zoom level).
