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    Re: Accuracy and sources of time
    From: Gary LaPook
    Date: 2011 Sep 27, 17:43 -0700
    I have always used a short wave radio to pick up WWV, WWVH and CHU.

    My current Torgoen watch gains less than 4 seconds per year but I still would carry at least one more watch, When a watch fails it gives no warning, it might suddenly stop and then start again or the rate might change. Without another watch to compare it to you can't be certain of any time taken off of even your most accurate watch. Three watches are better. Two watches will warn you of a problem but won't give you a solution. You should use whichever time places you closest to danger in working your sights. With three watches you can identify the one with the problem.

    gl

    --- On Sun, 9/18/11, Frank Reed <FrankReed{at}HistoricalAtlas.com> wrote:

    From: Frank Reed <FrankReed{at}HistoricalAtlas.com>
    Subject: [NavList] Accuracy and sources of time
    To: NavList@fer3.com
    Date: Sunday, September 18, 2011, 10:25 PM

    For all of you practical navigators as well as all of you not-so-practical navigation enthusiasts, what's your favorite source for time? A web site? A GPS device? A radio time signal? When you set or check a watch, how accurately do you worry about setting from any of these sources: one second, a fraction of a second? And when a good watch has been set, how often do you feel the need to double-check it? The obvious answer is "as often as possible" but consider two cases: when you have easy access to a time signal update, how often would you prefer to update (or put differently, what sort of updating frequency would be pointless or even obsessive), and for the other side of the coin, when you have no access, how long would you feel comfortable going without an update or double-check? We've talked before about trusting inexpensive watches for months or even as much as a year in an experimental situation. What's the longest you would really trust one in practice?

    -FER


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