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r1 - 2007-11-12 - 16:10:48 - SteveKosteckeYou are here: NTP >  Support Web > InexpensiveOemGps > GarminGPS18LVCPerformance
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Garmin GPS-18LVC Performance

ALERT! The information presented here is collected by the contributing authors, or others, and is made available on an as is basis. The information presented here does not constitute an endorsement or guarantee of performance by the NTP Public Services Project

Under a shingled roof / Soekris NET-4801 / FreeBSD-5.3release

Loopstats plot for a Garmin GPS-18LVC connected to a Soekris NET-4801 running FreeBSD-5.3release. The GPS was mounted approximately 12" under a shingled roof and the 4801 was sitting on a fibreglass batt, with the case cover removed, in an unheated attic crawlspace. The GPS was connnected to, and powered from, the 4801's internal serial port header. This plot is for January 1st, 2007 and was generated directly from the loopstats file instead of from periodic polls with a tool such as MRTG.

ntp0_kostecke_net-loop-20070101.png

The peer summary (generated with peersum.awk) for this period is:

ident       cnt  mean  rms   max   delay  dist  disp
=====================================================
GPS_NMEA(0) 5235 0.002 0.002 0.013 0.000  0.270 0.248

Ouside a window / White-box P133 / FreeBSD

MRTG plot of a Garmin GPS-18LVC connected to a white-box PC running FreeBSD. The GPS is mounted on a bracket outside a window. This plot is a snapshot of the current daily statistics for November 12th, 2007. Please note that you must subtract 20ms from the plotted value.

pixie_ntp-day.png

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