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    Re: Early Land Navigation.
    From: Greg Rudzinski
    Date: 2015 Feb 10, 08:42 -0800

    Thanks for the link Luc.

    I see that Sam observed the Moon and got to within 9' of GPS. He was satisfied but I think he probably did better than that. It would be of interest to look at the data for that Moon shot if Sam is watching.

    Greg Rudzinski

    From: Luc Van den Borre
    Date: 2015 Feb 10, 16:15 +0100

    On 10/02/15 15:26, Don Seltzer wrote:
    > Two years ago, historian Sam Willis stopped by this forum for advice
    > on land navigation.  He was about to participate in a re-enactment of
    > the 1869 Powell Expedition down the Colorado River, through the Grand
    > Canyon.  He was hoping to use a sextant to take some readings, but was
    > faced with the same problem of a high summer sun and an artificial
    > horizon.
    > The expedition was co-sponsored by the Discovery Channel and BBC, but
    > I don't think the program ever aired in the US.  I don't know if he
    > succeeded in taking any sightings.
    Yes - you can see him 'making his own mini ocean in a bowl' and taking
    moon shots after climbing to the rim of the canyon. The navigation bit
    starts 24 minutes into the second episode:
    He's got a pole with him, too.
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