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    Re: Chronometer Suggestions
    From: R B Emerson
    Date: 2009 Jan 6, 15:03 -0800

    For laughs and grins, I ran some fix data from another thread here
    through StarPilot, with and without adding a minute to the timing.
    The raw data is:
    AP 49-16.1 N 123-07.1 W (in British Columbia, Canada)
    All times GMT on 27-Nov-08
    Ic = 31.5' OFF, He = 0.0 ft (or meters ;-) )
    Body      WT         Hs
    Capella - 03:52:46 - 39-35.7
    Vega    - 03:54:45 - 32-06.9
    Altair  - 03:56:11 - 22-37.0
    That results in a fix of either
    (Watch Time without change)
    49-30.6 N 122-57.3 W
    (Watch Time + 1 minute)
    49-30.6 N 123-12.3 W
    Note there is no change in latitude, only in longitude.  Adding one
    minute gives a fix 9.75 nm west of the un-adjusted fix.
    On Jan 6, 4:32�pm, Alexandre E Eremenko 
    > Bill,
    > Of course. 1 sec of time = 15" =0'2.
    > (Same accuracy as a good sextant
    > measurement).
    > Alex.
    > On Tue, 6 Jan 2009, William Sellar wrote:
    > > As a beginning celestial navigator, I am wondering how much time and watch 
    accuracy is actually required for practical navigation.� Can we predict how 
    many miles off one would be for every second of time error?
    > > Bill
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