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    Re: The Darn Old Cocked Hat - the sequel 1
    From: William Hawes
    Date: 2013 Mar 12, 03:29 -0700

    Gary, Tom and all,

    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. Otherwise when well offshore I generally picked the position closest to the centre or if I had a good DR/EP, I would place the fix closest to the DR/EP position. Of course as Tom pointed out below, when transitioning from ocean to coastal to pilotage you typically were transitioning from heavily weighting celestial observations to other fiixing methods better suited to more confined restrictive waters.

    Which navy? I served as navigator of submarines (Oberon Class diesel boats) in both the Royal Navy and Royal Canadian Navy back in the 70's. I was a member of the RCN but served a 3 year exchange tour with the RN. We did hand sextant observations from the bridge when surfaced and, very occasionally, used the artificial horizon sextant that was built into the Barr and Stround Attack Peicope.

    wmh
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