[ntp:questions] Re: HOWTO prepare ntpd to the leap of a second

Roman Mäder newsXXF.10.rmaeder at spamgourmet.com
Fri Dec 30 08:38:50 UTC 2005

> ...
> GPS does better than that -- it broadasts the exact date and time (and
> direction) of the next leap second.  The firmware of most GPS receivers
> throw away that information and simply reduce it to a single trinary bit
> (+ve leap | -ve leap | 0 leap).

it seems that the NMEA refclock cannot handle the leap information. It
supports only the $GPRMC or $GPGGA sentences, which do not carry leap
information. It would have to parse the $PGRMF sentence, which seems to
carry this information (as indicated in the Garmin 18 manual)

Roman Maeder

More information about the questions mailing list