Before revision: HSIs were incorporated into the instrument panels of the Vickers VC10 and Concorde as well as being used on spacecraft like the Space URL On the HSI, the aircraft is represented by a schematic figure in the centre of the instrument – the VOR-ILS display is shown in relation to this figure.
After revision: On the HSI, the aircraft is represented by a schematic figure in the centre of the instrument – the VOR-ILS display is shown in relation to this figure.