Originally Posted by IO540
pipertommy
FM Immunity is required only for IFR in controlled airspace which for you and in England means Class D. In Class G you are OK.
In class G you are only ok if you don`t need to make an ILS approach . If you do, then you have to be FM immune. I have taken this up with local RADAR units and the CAA for clarification, with very little progress or understanding from anyone.