Don Poitras wrote:

Newps wrote:


All ATC facilities have the ability to see transponders at any altitude.
All ATC facilities also have software to inhibit the display of
replies so the radar display doesn't get cluttered up on the airport.
You took my response to be only while flying. I meant it all inclusive.
There's never a reason to have your transponder on any other setting
than ALT, unless otherwise directed by ATC.


How about to avoid the ****y tone in their request to turn it off 10
seconds after landing?


Why would ATC tell you to turn it off shortly after landing? There's no
reason for that. Tell him to properly set up his ARTS software.