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    Re: DR, was: No Lunars Era
    From: Ken Muldrew
    Date: 2004 Dec 7, 11:26 -0700

    On 7 Dec 2004 at 0:51, Trevor J. Kenchington wrote:
    > A fair point but perhaps not a relevant one: "Dead Reckoning" seems to date
    > back to the 17th century at least. Anyone have an OED to hand? That might
    > establish the first recorded use of the term.
    From the online OED
    Dead Reckoning
    The estimation of a ship's position from the distance run by the log and
    the courses steered by the compass, with corrections for current, leeway,
    etc., but without astronomical observations. Hence dead LATITUDE (q.v.),
    that computed by dead reckoning.
      1613 M. RIDLEY Magn. Bodies 147 Keeping a true, not a dead reckoning of
    his course. 1760 PEMBERTON in Phil. Trans. LI. 911 The latitude exhibited
    by the dead reckoning of the ship. 1840 R. H. DANA Bef. Mast xxxii. 124 We
    had drifted too much to allow of our dead reckoning being anywhere near
    the mark. 1891 Nature 3 Sept., The log, which for the first time enabled
    the mariner to carry out his dead-reckoning with confidence, is first
    described in Bourne's ?Regiment for the Sea?, which was published in 1577.
    1917 BOSANQUET & CAMPBELL Navigation for Aerial Navigators i. 4 In aerial
    navigation..Dead Reckoning is the position arrived at as calculated from
    the estimated track and the estimated speed made good over the ground.
    Ibid. 5 These data enable us to find a Dead Reckoning position. 1935 C. G.
    BURGE Compl. Bk. Aviation 477/1 Dead reckoning..is a compromise between
    pilotage and navigation.
    [there is no entry for "ded reckoning"]
    Ken Muldrew.

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