[ntp:questions] Garmin GPS 18LVC Setup but questions on best way

George R.Kasica georgek at netwrx1.com
Tue Dec 30 18:15:24 UTC 2008


>>>What am I doing wrong here when I add back GPS data to break this
>>>thing???
>
>
>>Next step....I added back GPS NEMA data without the gpsd daemon (I
>>don't pass the data out to anywhere so there's no real need for it)
>
>What does "I added back GPS NMEA" mean? What program did you use to do
>that? What reads teh NMEA data and passes it on to ntp.
Put the config lines back in ntp.conf so it would read the NMEA data.

>># ntpq -p
>>     remote           refid      st t when poll reach   delay   offset
>>jitter
>>==============================================================================
>>xGPS_NMEA(0)     .GPS.            0 l   13   16  377    0.000  -616.37
>>10.466
>
>Looks to me like you could get rid of that offset with a fudge.
What would be a good amount to use half the avg. erorr or ??

>>I have good PPS and am getting GPS NEMA in as well but the offset for
>>the NEMA data seems quite large....what would I do to fix that??
>
>Use the fudge to get rid of that offset. nmea is very very slow. And I
>suspect that you are having the Garmin report a huge number of nmea
>sentences. That takes along time to parse. 
>
>And it does not report on the resulting time until the sentences finish.
>Having just the one standard sentence would reduce that time.
How would I get that to occur? I don't see a way to cut down on the
data sent by the unit....




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