[time-nuts] My Garmin 18x, Ver 3.50, currently 1 second slow to UTC

Cook Mike mike.cook at orange.fr
Wed Dec 29 03:59:36 EST 2010

Ooops... 3.50 firmware is still available at garmin.. I had clicked the 
wrong link.. sorry

Le 29/12/2010 09:55, Cook Mike a écrit :
> Le 29/12/2010 08:32, David J Taylor a écrit :
>> Calling any Garmin 18x users,
>> I noticed this morning that my Garmin 18x was giving the time 1 
>> second slow to UTC - it has been running in sync with UTC for about 2 
>> years now.
>> []
>> So I wondered, any other folk out there with a Garmin 18x - is it 1 
>> second slow to UTC ?
>> Regards, Kiwi Geoff (Christchurch, New Zealand).
>> ________________________________________
>> Geoff,
>> I see the same effect on my GPS 18x LVC with the 3.50 firmware.  Have 
>> you reported this to Garmin?
>> To me it's unacceptable that the NMEA output is delayed into the next 
>> PPS signal, making the unit much less useful.  I measure the NMEA 
>> output and it's not even a consistent distance delayed from the PPS, 
>> varying quite a bit.
> It is possible that this has been reported as I do not see 3.50 
> available on garmin.com. 3.10 is the latest. Could not find anything 
> in faq's or alerts though. It would certainly be useful to have a 
> sentence transmission offset from UTC in the NMEA messages (or at 
> least a new message heading/tailing the list with that in). The NTP 
> driver has a fudge factor for time offset to end of NMEA stream which 
> can be used if you can measure it. You could scope it, (I am checking 
> a MG1613S at the moment) but that is not that easy if you are 
> selecting just one of the many messages being output. An easier method 
> might be to just have NTP tell you what it thinks the offset is when 
> measured against other references, then use that as your fudge 
> factor.(use noselect directive for the NMEA server or set its stratum 
> high so it doesn't get selected).
>> [New to this mailing list, so I had to fabricate this message as a 
>> reply to at least try and keep it "on thread"]
>> Cheers,
>> David
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