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[aprssig] Com port SHARING vs Com Port JOINING

Scott Miller scott at opentrac.org
Tue Jan 15 06:37:06 UTC 2008


> Also, most folks don't realize that "GPS Time" is NOT
> Earth time!  The GPS constellation does not follow leap seconds.
> This has happened something like 13 times, so GPS time is off by
> About that much from official "Earth Time".  Merely using a GPS

Oh, SOME of us realize it.. like those of us who have to try to 
implement the correction in little 8-bit micros with no time and date 
libraries... <grumble>

(FWIW, the NMEA outputs I've looked at seem to be corrected for leap 
seconds.  Garmin binary mode is NOT, but it does at least tell you what 
the difference is.)


Scott
N1VG





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