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Published online by Cambridge University Press: 18 January 2010
Equation (2) in the paper by J. Th. Verstelle on page 300 of the July number of the Journal should read The formula quoted on p. 301 for deriving the mean square error in the distance made good should read metres.
Refraction at Sea
The mean error quoted on line 8 of Captain Brett Hilder's paper (Vol. VI, p. 314) should read 1·2 miles, not 12 miles.