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GENERAL INTRODUCTION II THE DECCA SYSTEM
THE LORAN SYSTEM
THE CONSOL SYSTEM
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accuracy accurate adjusted aerial alternating current alternating voltage angle apparatus base line base-line extension beacon beam width bearing buoys cathode ray tube caused cent centre line channel chart coast coil corner reflector course cycle dashes Decca lines Decca Radar decometer depth determined direction distance dots echo sounder electric electrons error false echoes fixed frequency ground wave hyperbola increases indicated indirect radiation instance Institute of Navigation intersection interval kc/s knob lane identification lines of force lines of position located Loran lines Loran position maximum measured microseconds nautical miles objects observations obtained oscillator pair of stations phase difference picture plate port position line possible Radar installation radio radiolocation ramarks reading receiver reflected reflector rotating scale scanner screen sea-return sector ship ship's shown in Fig signals sky wave slave speed Stavanger stylus switch tion transmission transmitting stations U.S. Navy Department velocity of propagation vertical vibrations visible wavelength zero