NavList:

Although Gary addresses this somewhat by "allowing several SD's" I think it's important to emphasize a fallacy in William Hawes's procedure:
> Although perhaps not mathematically robust, when I was in the navy I was taught,
> that when in coastal or pilotage waters, to pick the worst scenario/most dangerous
> position in the cocked hat.

This ignores the possibility, which I hope we all accept, that the true
position is outside the hat -- the whole point of this discussion.
If a reef were 1/2 mile outside the cocked hat, should we feel safe?
Unfortunately, teaching to choose the worst position "in the hat"
seems to imply we should.
-- Bill N.
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