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    Re: Cocked hats, again.
    From: Peter Fogg
    Date: 2007 Mar 18, 09:18 +1100


    On 3/18/07, jferrari <jferrari{at}clara.co.uk> wrote:

    I am a relative beginner and have been following this interesting
    discussion. I looked in the Royal Air Force Navigation manual 1944, and on p
    116 it says,

    " If the errors of the bearings, from which the position lines are obtained,
    are all of the same sign...the actual position of the aircraft may be
    outside the cocked hat. It is more often the case that errors in measurement
    are quite haphazard, and hence the navigator cannot tell which of the seven
    positions (refers to a diagram) contain the actual position of the aircraft.
    For this reason the centre of the cocked hat is assumed for all practical
    purposes to represent the fix, provided the sides of the cocked hat are not
    excessively long."

    So that gets it right, too. Good clear advice, and if more often expressed could avoid this tedious 25% / 75% so-called controversy.


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