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The accuracy of fixes obtained by HF direction .finding s.tations has bee n exami!led by means of a dispersion factor computed for each fix ; thiS factor is a measure of t he consiste ncy of bearings t a ken from different stations on the same transmission . It is shown t hat t he accuracy is significantl y lower during times of ionospheri c storms than at times \I'hen n o storm occurred, and that the effect of the s torm is mainly on fixes in volving F2 layer propagation.

Influence of ionospheric conditions on the accuracy of high frequency direction finding