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    Re: Calculators
    From: Bill Murdoch
    Date: 1999 Sep 01, 9:54 PM

    I have had a good time playing with the Texas Instrument calculators.  They
    are inexpensive, easy to program, and readily available.  I have TI-67 Galaxy
    that I bought new for UKL 17.  The February 1994 copy of Practical Boat Owner
    has an article which contains a sun sight reduction program for that
    calculator.  I also have a TI-81 and wrote a similar program for it.  That
    program was published in the March 1996 issue of Cruising World.  I have
    modified the sun sight program for the TI-82 and TI-83.  If you wish can send
    you a copy.  The program contains a 0.1', 200 year solar almanac.  Given the
    time and date, the sight data, and the DR, it returns the azimuth and
    intercept.
    
    I also wrote a much longer nav program for a TI-82 which has almanacs for the
    sun, moon, four planets and 92 stars.  It has all be bells and whistles -
    unknown bodies, mercator and spherical sailings, sun rise and sun set, etc.
    I sold copies for a few years of the typed program and of the program on
    diskette (the diskette can be loaded on the calculator through a PC).
    
    I learned a lot writing the programs.  I had a good time doing it.  The TI
    calculators use a language much like Basic and can be programed either
    through their keypads or through a PC connected to the calculator with a
    TI-Graphlink cable.  The math is tough, but people did it in the 1800s with
    little more than logarithm tables.
    
    Bill Murdoch
    

       
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