as approximately 1,000 meters, several enemy aircraft were shot down from a combat distance of 1,500 meters. The EZ 42 was compared with the Allied G.G.S. captured from in a P-47 Thunderbolt in September 1944 in Germany. Both sights were tested in the same Fw 190, and by the same pilot. The conclusion was critical of the moving graticule of the G.G.S., which could be obscured by the target. Compared to the EZ 42, the Allied sight's prediction angle was found on average to be 20% less accurate, and vary by 1% per degree. Tracking accuracy with the G.G.S. measured as the mean error of the best 50% of pictures was 20% worse than with the EZ 42. Usage (Mark II Gyro Sight) Avro Lincoln Blackburn Firebrand Chance Vought F-4U Corsair de Havilland Hornet & Sea Hornet de Havilland Mosquito de Havilland Vampire de Havilland Venom & Sea Venom Fairey Firefly Gloster Meteor Hawker Hurricane Hawker Tempest Hawker Typhoon Hawker Fury & Sea Fury Hawker Sea Hawk Lockheed P-80 Shooting Star North American P-51 Mustang North American F-86 Sabre North American F-100 Super Sabre Republic P-47 Thunderbolt Republic F-84 Thunderjet Supermarine Attacker Supermarine Seafang Supermarine Spiteful Supermarine Spitfire See also Head-up display – the further evolution of the gyro reflector gunsight References Bibliography Hahn, Fritz. Deutsche Geheimwaffen 1939–1945. Flugzeugbewaffungen. Heidenheim: Erich Hoffmann Verlag, 1963. External links A more complete explanation of the gyro gunsight RAF, Luftwaffe and USAAF gunsights of WW2 www.cocpitinstrumente.de – EZ 40 Kreiselvisier (in German) Military optical devices British inventions Ferranti