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    Re: History of The Air Almanac
    From: Frank Reed
    Date: 2010 Nov 23, 21:23 -0800

    Jeremy, you wrote:
    " The reason for this is the USN will probably never go 100% digital due to vulnerability during war."

    I really don't buy this. It's too similar to old arguments from the latter half of the nineteenth century saying that navies would never give up lunars because chronometers could be deranged by concussions from naval artillery. Also, celestial is not even close to a real backup for the sort of position-finding provided by GPS and other GNSS systems. The accuracy of (non-digital, non-electronic) celestial is much lower, fixes are few and far between, and it's useless under clouds. The vulnerability of GPS in war is, however, a guarantee that other high-accuracy navigation systems will be (are being) fielded. Celestial navigation will always have SOME place in the navigator's set of tools, as a backup for the backup for the first-line backup to the primary positioning system, whether a GNSS system or something else.


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