[LEAPSECS] it's WP7A week in Geneva

[Warner Losh]

It all depends on your application. If you are controlling Loran C  
signals, no data is better. The Loran stations cant broadcast the  
wrong tomr and have some heuristics that make it a painful operation  
to restart. High power transmitters are like that.   Likewise for a  
stratum 1 ntp server.

Storing a value in ram works poorly for spares that sit on the shelf  
for years at a time.

No error indication is the really bogus part. I could accept an  
educated guess so long as it is flagged as such. Holding it up to  
being correct is bogus.

Mostly works most of the time is not comparable with many gps  
applications. Maybe it is time to learn from them and improve the  
system.


Warner


On Oct 4, 2009, at 8:11 AM, "Clive D.W. Feather" <clive at davros.org>  
wrote:


> Poul-Henning Kamp said:

>> Using a GPS-UTC delta from memory, before we have an updated value

>> from the sats is just plain old bogusly wrong.

>

> Disagree.

>

> I've got a GPS receiver here. It reports UTC so, I presume, uses a  

> stored

> delta until it picks up a new one. For the uses I have for it, an  

> error of

> 1 or even 5 seconds (but not 30) is far more useful than "no data".

>

> -- 

> Clive D.W. Feather          | If you lie to the compiler,

> Email: clive at davros.org     | it will get its revenge.

> Web: http://www.davros.org  |   - Henry Spencer

> Mobile: +44 7973 377646

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