Decca Night errors

From International Dictionary of Marine Aids to Navigation
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4-4-170

Night errors (in Decca)

Errors in Decometer readings due to reflected waves from the ionosphere arriving with a different phase from that of the groundwaves from the transmitter.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM