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See [http://en.wikipedia.org/wiki/Aviation_transponder_interrogation_modes] for official description. Civilian Mode-S and Mode-C both transmit pressure altitude (at 10-foot and 100-foot precision, respectively). To do this the transponder needs an altitude source. In real-life this can be a separate box called an encoder, or may be derived for FMC / ADIRU sources. It's important to note this altitude is referenced to standard pressure (29.92 inHg / 1012Hpa), and not corrected for actual barometric pressure in the local environment. | See [http://en.wikipedia.org/wiki/Aviation_transponder_interrogation_modes] for official description. Civilian Mode-S and Mode-C both transmit pressure altitude (at 10-foot and 100-foot precision, respectively). To do this the transponder needs an altitude source. In real-life this can be a separate box called an encoder, or may be derived for FMC / ADIRU sources. It's important to note this altitude is referenced to standard pressure (29.92 inHg / 1012Hpa), and not corrected for actual barometric pressure in the local environment. | ||
Additional support for military modes is possible if anyone wishes to add it. | |||
== Configuration in Flightgear == | == Configuration in Flightgear == |
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