Pocket navigation aids which last almost indefinitely

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  • BFMIN

    Active Member
    Nov 5, 2010
    1,635
    Western MD
    Anybody tried these as a backup?
    I looks like you need both the “Sundial” & the “Nocturnal”?
    The Sundial also doubles as a compass & the Nocturnal as a tide calculator.
    I had something similar many years ago & it was surprisingly accurate & repeatable.



    https://www.pocket-sundial.com/
     
    Last edited:

    BFMIN

    Active Member
    Nov 5, 2010
    1,635
    Western MD
    That works, but is only usable at a fixed location & takes a lot of time.
     

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