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    Re: U-boat Celestial Navigation WWII
    From: Gary LaPook
    Date: 2016 Apr 12, 10:05 -0700

    i Brad, I will now start investigating the MHR-1 in earnest, starting by reviewing the discussions on NavList.  I have read the excellent paper by Ronald R.W. van Riet. This will be a challenge since as yet I have not found any WWII era documentation on the MHR-1 beyond the brief instructions afixed to the device.  One would imagine there would have been at least a phamplet if not a book describing how to use it along with some sample problems.  If anyone knows of such a document, please let me know.  Additionally, with my limited experience it will be hard to move step by step through a sight reduction without being able to hold one in my hands.  Once I get familiar with the information at hand, perhaps I can find one not too far from where I live and work with it. Jerry


    A quick way to learn how the computation was done on the MHR-1 is to build a flat Bygrave which does the exact same computation exactly the same way. The Bygrave was the original version of MHR-1. You can build one of these in less than an hour for just a few bucks, the most expensive thing is buying the transparent sheet to use in your computer printer. It consists of just two printed scales, one on paper and the other on a transparent sheet that is moved in relationship to the other scale. See attached images, that's the whole thing.

    See complete instructions here:





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