Regardless, I.I. is quite right about the SAR support here in Oz. We're not supported in any way, shape or form in the manner that you may be used to in the UK before or after CivSAR came about.
Indeed, primary responsibility for SAR in most States is held by the State police force regardless of the capability or otherwise of their air assets. The coroner would be most unlikely to make an adverse finding because of a shortfall in a private company funded system.