[ntp:questions] NMEA refclock on Windows and ntp 4.2.4 does not set the time but logs clk_fault

Michael L. Semon mlsemon33 at verizon.net
Mon Apr 16 23:28:37 UTC 2007

Lindholm Roger wrote:
> Hi,
> I am running NTP 4.2.4 on Windows and am trying to get the NMEA refclock
> to work with a Garmin GPSmap76. I am using a serial cable connected to
> COM1 at 4800/8/1/N and no flow control. I am receiving what looks like
> the correct messages and the debug output don't show anything strange
> (as far as I can comprehend). It does however not set the time and it
> logs event 'clk_fault' (0x03). The debug output shows the following for
> each NMEA record received:

[too much snipping]

> refclock_gtraw: fd 1808 time 3385723813.932521 timecode 126
> $GPRMC,145812,V,5938.5864,N,01706.8010,E,0.0,0.0,160407,3.6,E,S*15
> $GPRMB,V,,,,,,,,,,,,A,S*0E
> $GPGGA,145812,5938.5864,N,0170

Your GPRMC sentence is reporting that you do not have a valid position, 
and your GPGGA sentence is invalid.  Make sure that the GPS is gathering 
valid position fixes so it will output data that the NMEA driver can use.


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