the angle directly on a cathode ray tube display in the submarine. This was still under development when the war ended. Although Naxos was useful against ASV Mk. III, by 1944 the British and US were already well on their way to introducing newer magnetron-based radar systems, like the American H2X, operating at even higher frequencies in the 3 cm band. The first of these ASV Mk. VI radars were being introduced to service just as Naxos was being fitted. As a result, Naxos never had as great a success as the Metox it replaced. Other developments Experiments with a ground-based version of Naxos using directional antennas had been carried out under the name Corfu. Some effort was made to develop this into an airborne version, FuG 351 Corfu Z, but this never entered service. An attempt to address the limited resolution of Naxos was undertaken in the Korfu, which had a better antenna system and more sensitive receiver. Naxos receivers were also combined with the parabolic antennas from Würzburg radar systems to produce a long-range receiver tuned to the British Oboe radio navigation system. The system later used a Domeyer receiver and became the Naxburg system. Oboe broadcast pulses from the aircraft that needed to be powerful enough to be received by ground stations in the UK. This made them relatively easy to pick out at short ranges, as long as the receiver was tuned to a suitable frequency. When such a signal was detected, false pulses identical to those received from the aircraft were re-broadcast from the ground. Stations in the UK thus received two or more signals for every signal they sent out, which confused the detectors. See also H2X, the American X-band bombing radar immune to detection from the Naxos detecting device. References World War II German electronics Radar warning receivers Military equipment introduced from 1940 to 1944