When approaching an airfield I action the Silence All facility on the "Radar Screen". That is fine for aircraft but doesn't silence airspace and terrain warnings. This disrupts the receipt of airfield transmissions and hence becomes a safety issue. When I select "Silence all" I want it to do just that. How do I overcome that without disabling the Bluetooth source which is a bind during a high activity phase of the flight.

There is no SkyDemon facility to disable all warnings. Having said that, terrain warnings are disabled when you're within a certain radius of your destination (I think 5nm).