How often are IM Conditions so widespread that no VFR are flying (below the rarified atmosphere of FL290?).
For the technical experts, how hard/costly will it be to upgrade from a version 0 system (meeting the DO-260 standard) to a version 2 system (meeting the 260B standard)?
As I recall, one of the reasons for people resisting the proposed subsidy ‘carrot’ was that their aircraft would end up with an ‘orphan’ system.