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They are allowed modern SSB and Ham radios so no problem with radio
time signals.

I seemed to remember from when I had mechanical watches they were
accurate to plus or minus  a few (<10) seconds a day. This article
http://www.chronocentric.com/watches/accuracy.shtml by watch
enthusiasts says 10 secs/day is worst for a modern mechanical watch
and 5s/day typical, 3 sec per day typical for "chronometer certified"
watch. It seems to me getting a few reasonable modern mechanical
watches, and finding the best by calibrating them, or taking several
and averaging, would get you sufficient accuracy for CN if you checked
it against a radio time signal once a day.

By the time I learnt CN there were cheap electronic watches, but I
seem to remember from my teachers they did what I said above (with a
simple shortwave receiver for time signals).

Bill

On 2 January 2017 at 19:18, Frank Reed  wrote:
> Jeremy C suggests on the Facebook page for the Golden Globe Race that one
> can get traditional chronometers from ship breakers in India and Bangladesh.
> Has anyone done this recently? Do they turn up on ebay at reasonable
> prices??
>
> Frank Reed
>
> 



--
Professor of Applied Mathematics
http://www.maths.manchester.ac.uk/bl

   

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