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    Non Electronic Sight Reduction
    From: Greg Rudzinski
    Date: 2009 Dec 13, 18:07 -0800

    Today I was able to work a morning Sun line five different ways using just 
    tables (Pub. 249, Weems, Dreisonstok, Ageton, and Trig/Log). The LOP results 
    were all within one nautical mile of each other. The only interpolation done 
    was for Declination using Pub. 249. One side of one sheet of paper easily 
    contained all five reductions.
    
    Personal impressions of the various methods
    
    Rank:
    1. Pub. 249
    2. Weems Line of Position
    3. Dreisonstok Pub. 208
    4. Ageton Pub. 211
    5. Trig/Log Tables
    
    Pub 249 is exceptionally fast to use but is a large table. Intercepts can be 
    large. Declination limited to 29° on volumes 2 and 3.
    
    Weems and Dreisonstok are very quick with Weems coming out on top with the use 
    of a graphical solution for determining azimuth.
    
    Ageton involves an extra summing but is a bit more accurate. Intercepts are 
    short due to using the DR position as the assumed position.
    
    Trig/Log tables involve the most summing and table page turning but still 
    practical and accurate. Intercepts are short due to using the DR position as 
    the assumed position. An excellent companion to a calculator or sliderule.
    
    
    I like all of the above methods and recommend that navigators give each a try 
    to determine the best clutch of tables to keep on hand. Even though Ageton 
    Pub. 211 ranks 4th it is stowed in my sextant case because it is thin and 
    compact.
    
    
          
    
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