No better pic of the GPI I’m afraid. But to go back to the original question here’s a picture of the df control wheel.
Bri, were the Astrographs ever exchanged for the GPIs on the Lincolns or did Astrographs cease to be used?
The Lincolns I worked on were RAAF long-nosed ones. I don’t think our navs used astrographs. They did use a Drift Sight, which gave them drift angle which, I think, was input manually on the GPI.
The ADRIS had an AMU (Air Mileage Unit) which had a stepping motor output (M-type repeater) of airspeed, plus an API which gave lat/long readouts. The AMU needed a kick every now and then, because it had a post office relay that could ‘stick’ – they were a pain to set up I can tell you!
The maps were secured under a perspex cover – hinged, I think.
Although it wasn’t really accurate, the ADRIS was quite an advanced system for its time, as other air forces relied on sextants and radio nav. ADRIS was self-contained and used in British aircraft because radio nav could be used to detect the aircraft.
Further developments resulted in the GPI Mk 4 series, which had Doppler inputs. Then a development of that item was the moving map system used in the TSR-2.
I could write a book on the development of navigation systems!
Bri 🙂
Sign In
