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    Re: Navigation Survey
    From: Bill Noyce
    Date: 2001 May 25, 1:30 PM

    Navigation-L Survey
    
    I've been experimenting with a minimalist approach.
    Tools are an orienteering compass (for protractor) and a pencil.
    Plotting sheets are notebook paper.
    Tables consist of the following 8.5x11 sheets:
       One sheet trig tables.  Front has log sec & log csc every
          10' for angles 6 to 45 degrees, plus interpolation help;
          back has log csc for every minute from 1' to 8 degrees,
          plus log sec for every 10 minutes.
       One sheet anti-log tables (100 lines of 10 entries
          plus interpolation help).
       One sheet sun almanac (Daily GHA & declination)
       One sheet with star positions on front (considered good for
          a whole year) and useful tables on back (Aries per month,
          day, hour, minute; Dip, Refraction)
       Six sheets of Moon positions every 4 hours I haven't had to use...
       Recently added one sheet for each of Mars, Venus, Jupiter, Saturn
    
    With a good time source, this should allow (slow) navigation that
    is not significantly less precise than the sextant sights.
    The theory for the moon positions is that they would allow setting
    the time source...
    
    a) Dead Reckoning
    
            What is the method used most?
        Mid-Latitude
    
    b) Sight Reduction
    
            Which is your primary Sight reduction method?
        Computer Program(Name?)--------:
        Calculator(Name?)--------------:
        Short Navigation Tables,
            H.O. 211 etc.(Name?)-------:  Ageton's method, but with the
    short
                                          trig tables described above
        Standard Navigation Tables,
            229, 214 etc.(Name?)-------:
        Other(Name?)-------------------:
    
    c) Plotting
    
            How do you do your plotting?
        Computer Program(Name?)---:
        Universal Plotting Sheets-:
        Maneuvering Board----------:
        Radar Plotting Sheets-----:
        Home Made(Describe)-------:  Notebook paper turned sideways, using
                                     angled line to measure for latitude
    lines
    
    d) Navigation Manuals
    
        Name your main reference manual-:
            Bowditch, a mid-60's edition borrowed from a friend
            (It's one thick volume but includes the tables)
    
        Name a manual/book that helped you the most-:
            Bowditch
    
    e) Do you use the Nautical Almanac?
            Commercial-:
            USNO-------:
        Computer-generated Almanac described above, checked with Henning
        Umland's Sun/Moon calculator and USNO's Online Almanac
    
    
    
    
    
    
    
    Dan Hogan WA6PBY
    Catalina 27 "GACHA"
    dhhogan{at}verimail.com
    Navigation-L List Owner
    http://www.wa6pby.com
    

       
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