The relevant Irish document does not appear to have escaped into the wild (and I know a few foot-soldiers in Ireland who would dearly like to understand more about this) but here is a definition from the UK's CAP 999.
"SAR Technical Crew
A member of the SAR crew (e.g. winch operator, winchman) other than flight crew who is assigned to a helicopter SAR flight for the purpose of operating specific aircraft and role equipment, assisting the flight crew during the mission and attending to any person in need of medical assistance."
Since the UK SAR contract spec, and state of regulatory development, is quite advanced we might expect that an Irish definition would be either similar or less advanced.
Anyway, nothing there about navigation or obstructions or, as Crab has pointed out, flying the aircraft using hover trim, often when the aircraft is as close as it should ever be to rocky obstructions.