Sonne(redirected from Sonna)
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A low-to-medium frequency, continuous wave, simple and reliable, long-range radio aid to navigation, whose emissions, by means of their radio frequency modulation characteristics, enable bearings or position lines to be determined. It is used principally for transoceanic navigation. The only airborne receiver required operates in the frequency band of 200 to 400 kHz. The information is given in the form of position lines. A Consol station consists of three aerials located in a straight line radiating dashes and dots. These signals are heard as either dashes or dots or as a continuous tone. This pattern is overprinted over special charts. This navigation system is now extinct. Also known as Sonne.
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