[aprssig] Com port SHARING vs Com Port JOINING

Scott Miller scott at opentrac.org
Tue Jan 15 01:37:06 EST 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.)


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