[ntp:questions] how to have offset < 1ms

unruh unruh at wormhole.physics.ubc.ca
Tue Apr 13 15:18:21 UTC 2010

On 2010-04-13, Dave Baxter <spam at goes.nowhere.com> wrote:
> In article <slrnhs78pu.kb3.unruh at wormhole.physics.ubc.ca>, 
> unruh at wormhole.physics.ubc.ca says...
>> On 2010-04-12, lhommedumatch <ludocluba at yahoo.com> wrote:
>> > I'm working on a oceanographic vessel
>> > ntpgmtaceb is our reference clock that is synchronised with a gps at
>> > the beginning of a cruise.
>> Why not put a Garmin GPS 18  on board the ship and get gps time on the
>> whole cruise?
> I was going to ask that too.  For such an outfit, there are good "COTS" 
> GPS driven NTP servers just for that sort of application.   (Or you can 
> struggle like some of us to roll your own...)
> There are WWV referenced boxes too (reception should be good with that 
> size salt water ground plane!) and no doubt a whole host of other 
> satllite derived things, so you are not tied to one potential point of 
> failure.  As well as any indipendant on-board Rubidium source?
> There must be a valid reason for not going that sort of route, it'd be 
> enlightening to know why.
> Unless "oceanographic vessel" is a euphamism for something that spends 
> much of it's time "out of sight of any satellites!"
But in dock it is surely not out of sight. 

> Cheers.
> Dave B(G8KBV)

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