At 10:35 PM 20/04/2012, you wrote:
Transponders work OK if being interrogated by a secondary radar. No
use outside of radar coverage.
However, there are many more active devices appearing that do not
rely upon being interrogated and broadcast (a la FLARM and ADS-B).
I reckon watch this space
Not true, TCAS will trigger your transponder outside radar coverage.
Mike
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