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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
or
(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.

Cheers,
Rick

On Jan 6, 4:32�pm, Alexandre E Eremenko 
wrote:
> 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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