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    Re: Portuguese shipwreck question
    From: John Huth
    Date: 2009 Nov 1, 17:18 -0500
    It's actually a journal article written in Isis.   Isis does have an online archive, so you can dig it up free of charge, but I believe you have to register to get it:

     John K. Wright, “Notes on the knowledge of latitudes and longitudes in the middle ages,”  Isis, Vol. 5, No. 1 (1923) pp. 75-98

    I just copied his table out of that article.   The scatter plots were my first crude attempts to see if I could figure out what these places corresponded to.   I didn't get as far as actually putting onto a Mercator projection, however.   If you know of some software were one can input these points onto a Mercator projection, that would be nice, although I can probably cobble something together using Mathematica. 

    Attached is an attempt to draw a map on a rectilinear grid (not a Mercator) and my guesses as to some of the place names - modernized.  

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    File: 110375.john-k-wright.doc
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