A couple of nights ago I was flying south in the lane towards Prospect when a Chieftain broadcast that he was flying from Prospect north in the lane. We acknowledged and turned our landing lights on but could not see the other aircraft. Sydney Radar then advised us he was at our 12 o clock at 5 miles, then at 2 miles and eventually we saw him, with only his Nav. lights on. At our hight about a 1/2 mile away. This service would not be available if the lane was a MBZ. And "thanks Sydney Radar for helping out"