Mode S IMC question
I fly an a/c owned by an IFR rated commercial pilot.
I am a humble IMC rated PPL
We both seek to know whether or not Mode S is required for IMC flight after March 2007 as it will be for IFR
Varying 'views' abound about this - can anyone give definitive direction on this and ideally guide me to source material ?
Many thanks in anticipation.........