Homonculus, in most UK H.E.M.S units, H.E.M.S Crew members/paramedics are a tad more than "amateur map readers/radio changers", they are an integral part of the flight crew involved in not only navigation, but pre landing/take off checks, assisting the Pilot with ILS information and comms with various ground units/control rooms.
According to appendix 1 JAR OPS 3.005 d all HEMS crews in Europe are 2 pilots or 1 pilot with 1 HEMS Crew Member, the latter with additional knowledge in cockpit work...
By the way, in the German Airforce the experienced crewchiefs on the UH-1 often could fly better than the young pilots
.... but officially they werent allowed to touch the controls!
skadi