 Its location next to the Brisbane River demonstrates the need to detect enemy vessels attempting to infiltrate upriver, and the placement of the control hut reveals the bearing of the PE beam transmitted from Fisherman Islands.The layout of the rooms in the control hut provide evidence of the functions of such a facility, with the indicator loop room having an observation window over the river and the PE beam room having a large window to receive the beam transmitted from Fisherman Islands.The place is important because of its aesthetic significance.