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    Re: DIY Tables?
    From: Wolfgang Hasper
    Date: 2015 Aug 27, 16:28 +0200
    Hi Peter,
    you may wish to try the flat bygrave slide rule a la Gary LaPook.
    comprehensive description.
    simple and inexpensive, waterproof, just two sheets of film
    usage might appear daunting at first but is really simple if done a few times and you can make a nice pro-forma to assist.
    Add a long term almanac and you are prepared
    And If you get hooked and wand a more convenient rule, do a remake of the original concentric setup.
    I can still supply suitable tubes and postscript code for generating the scales is also available [in the NavList archives] :o)
    Works a charm and is really not that much work for a handy person.
    Gesendet: Donnerstag, 27. August 2015 um 00:27 Uhr
    Von: "Peter Dijkstra" <NoReply_Dijkstra@fer3.com>
    An: wolfgang.hasper{at}web.de
    Betreff: [NavList] DIY Tables?

    Hello Everyone,

    Being relatively new to this group I thought a small introduction may be appropriate.

    I am a Dutch airline pilot (MD11) with the intention to do a circumnavigation when I retire on a 48’ sailboat I am currently building at home.

    Though I was pretty good at math at high school, spherical geometry has never been one of my strong sides.. I sort of know how it works but as soon as things other than sin, cos and tan appear I’m getting lost quickly. I get the principle of celestial navigation but it sort of stops there, though I’m keen to improve my knowledge in area :-)

    The recent discussion about Doniol calculations has drawn my interest as an alternative to the Reeds Almanac method I am now trying to learn to reduce sight taken on my sextant.

    My aim is to have a workable alternative to all the electronics that surely will make it onto my boat, in addition to a serious computer (I’m currently thinking Mac Pro) that will run most of the ships systems.

    I really like the idea of being able to bypass or disable all automatic systems and go back to manual operation.

    Navigation has always interested me. Last year I finally found a reasonably priced Freiberger sextant and bought a Reeds Almanac. So far I have only reduces sun sights but found that I am making a lot of errors reading/interpreting the tables. I get the impression that the Doniol method is less error prone than the Reeds method.

    On my boat I intend to include in a (small) binder like a Quick Reference Handbook, on A5 or one-half letter-sized (5.5” x 8”) paper, like I have on my planes. It would include some other emergency related information like the location of seacocks and VHF/DSC communication templates for my fellow shipmates that may not exactly what these procedures are..

    I am looking for a reduction method with tables that is relatively simple that will fit on a this size paper, if I could add a nautical almanac in that size for a certain trip would be a bonus ;-)

    Any suggestions on how to make this happen?

    Kind regards,


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