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On Sat, 20 Apr 2002 11:18:30 +0100, George Huxtable wrote:

>Williams says-
>
>"Fig 14.6 is the cocked hat formed by three position lines. If no
>information is available on the distribution of error the probability of
>being in each of the seven zones defined by the cocked hat is as shown in
>the figure. The proof is so simple that an outline of it is given in note

If a mariner takes a series of LOPs, and they come somewhere near to
defining a position, he has a lot of information about the error
distributions. The assumption of no information at all implies equal
probability anywhere in the world. Under that assumption (only) the
division into left and right at 0.5 each for a LOP makes sense. That
means each bearing could as easily have been 90 degrees away from where
it just happened to fall. Come on guys.

Maybe someone would like to compute the probability of a tight cocked
hat occuring in the first place from such useless data.

Disclaimer: I have made navigation errors, two resulting in insurance
clames. I am 66 years old and still alive.
Rodney Myrvaagnes                                                        J36 Gjo/a


"Nuke the gay whales for Jesus" -- anon T-shirt

   

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