Though the aircraft was IFR equipped, and the pilot was IFR certified, I wonder if the pilot was IFR current in that helicopter since the company operated as VFR only. As a VFR only company, they may not have given the pilot the opportunity to maintain his IFR currency or even his annual IPC. Inadvertent IMC is evaluated each year on the Flight Review. I can foresee Garmin noticing this and developing (if not already) a helicopter specific ‘Inadvertent IMC’ button just for these instances. Similar to their recent ‘Auto Land’ products.